Chapter 12:
Just fresh and starting out. Only two paladins to compare.
Marcus - 31/15/15/11/10/8/8/11
Lowen - 23/7/5/7/7/0/3/10
You don't have to be a mensa to figure things out here. Marcus has the following leads:
8 Hp
8 Str
10 Skl
4 Spd
3 Def
8 Res
5 Luk
1 Con
In addition to Marcus' ability to wield axes, it amounts to something like this.
Marcus has: 22 more hit, 8+ more Atk, 3 more Def, 8 more Res, 4 more AS, 13 more Avoid, and 5 more critical. Marcus also has an additional 15 hit and 1 atk vs. Lances due to WTA. Marcus slaughters Lowen at this point, no question.
Chapter 17: Now it gets interesting... not.
Marcus, ??/4 - 33.0/15.9/16.5/11.8/10.4/9.0/8.9/11
Lowen, 10/0 - 30.2/9.4/7.4/9.4/10.2/2.4/7.0/10
Kent, 9/0 - 26.8/9.2/10.0/10.6/7.0/3.0/3.6/9
Sain, 9/0 - 25.4/12.8/6.8/9.2/7.6/1.6/6.8/9
Stat comparisons:
HP: Marcus >2.8> Lowen >3.4> Kent >1.4> Sain
Str: Marcus >3.1> Sain >3.4> Lowen >0.2> Kent
Skl: Marcus >6.5> Kent >2.6> Lowen >0.6> Sain
Spd: Marcus >1.2> Kent >1.2> Lowen >0.2> Sain
Def: Marcus >0.2> Lowen >2.6> Sain >0.6> Kent
Res: Marcus >6.0> Kent >0.6> Lowen >0.8> Sain
Luk: Marcus >1.9> Lowen >0.2> Sain >3.2> Kent
Con: Marcus >1.0> Lowen >1.0> Sain >==> Kent
Marcus still has substantial leads in Strength, Skill, and Resistance, while still leading in everything else. Lowen, for all intents and purposes, has caught Marcus in Defense, but marcus still has more HP and resistance. Marcus has a far better offense than every other cavalier, hands down.
Chapter 22: This one's actually close, but unfortunately for the other cavs, Marcus has already been the most useful for half the game. Did I mention the more difficult half? Isadora's mostly a novelty, but I'll include her as well.
Marcus, ??/7 - 34.9/16.8/18.0/12.5/10.9/10.1/9.8/11
Lowen, 16/0 - 35.6/11.2/9.2/11.2/12.6/4.2/10.0/10
Kent, 15/0 - 31.9/11.6/13.0/13.3/8.5/4.5/4.8/9
Sain, 15/0 - 30.2/16.4/8.9/11.6/8.8/2.8/8.9/9
Isadora, ??/1- 28/13/12/16/8/6/10/6
Stat Comparisons:
HP: Lowen >0.7> Marcus >3.0> Kent >1.7> Sain >2.2> Isadora
Str: Marcus >0.4> Sain >3.4> Isadora >1.4> Kent >0.4> Lowen
Skl: Marcus >5.0> Kent >1.0> Isadora >2.8> Lowen >0.3> Sain
Spd: Isadora >2.7> Kent >0.8> Marcus >0.9> Sain >0.4> Lowen
Def: Lowen >1.7> Marcus >2.1> Sain >0.3> Kent >0.5> Isadora
Res: Marcus >4.1> Isadora >1.5> Kent >0.3> Lowen >1.4 > Sain
Luk: Lowen >==> Isadora >0.2> Marcus >0.9> Sain >4.1> Kent
Con: Marcus >1.0> Lowen >1.0 > Sain >==> Kent >3.0> Isadora
Marcus is still the best of the four by a significant margin. Sure, he gets beat in a couple stats and people come close in others, but Marcus is in the top three in every stat, top two in all but two, and still holds the crown in Strength, Skill, and Resistance (The latter two by significant margins), but he's still by far the best. Sain approaches Marcus in strength, but loses to him badly in Defense and skill. Isadora crushes Marcus in speed, but not only does she get crushed back in strength, but her low CON makes either her speed lead dwindle or her or her str loss to be even worse. Lowen beats Marcus by a little in HP, def, and Luk, but he also gets crushed in strength, skill, and resistance, and loses by a fair bit in speed as well. Finally, Kent only wins in speed, but loses badly in luck and strength.
Marcus is still the best pally, and none of the three endgame prospects can compare much to him at this point.
Chapter 27: Is the Marcus out of gas?
Note, the standard chapter for promotion seems to be Unfufilled Heart (CH26), so thet's when Kent and Sain promoted (Lowen promoted on Crazed Beast)
Marcus, ??/11 - 37.5/18.0/20.0/13.5/11.5/11.5/11.0/11
Lowen, 20/3 - 43.0/14.0/12.0/14.0/17.0/7.0/13.0/12
Kent, 20/2 - 39.0/15.0/17.0/17.0/12.0/7.0/6.0/11
Sain, 20/2 - 37.0/20.4/12.0/15.0/12.0/5.0/11.0/11
Isadora, ??/5 - 31.8/14.5/13.7/18.5/9.0/7.2/12.3/6
HP: Lowen >4.0> Kent >1.5> Marcus >0.5> Sain >5.2> Isadora
Str: Sain >2.4> Marcus >3.0> Kent >0.5> Isadora >0.5> Lowen
Skl: Marcus >3.0> Kent >3.3> Isadora >1.7> Sain >==> Lowen
Spd: Isadora >1.5> Kent >2.0> Sain >1.0> Lowen >0.5> Marcus
Def: Lowen >5.0> Sain >==> Kent >0.5> Marcus >2.5> Isadora
Res: Marcus >4.3> Isadora >0.2> Lowen >==> Kent >2.0> Sain
Luk: Lowen >0.7> Isadora >1.3> Marcus >==> Sain >5.0> Kent
Marcus VS. others (Stat leads are rounded up if 0.5 or higher, rounded down elsewise)
Marcus vs. Sain
Marcus has:
1HP
8Skl
7Res
Sain has:
2Str
2Spd
1Def
Their Luk and Con are the same.
This is a mighty close one. Marcus' leads are bigger, but in less important stats. Defensively, I'll give the win to Marcus, as 7Res outweighs 1 Def, but Sain's offensive leads barely trump Marcus' defensive advantages.
Winner: Sain. Passed Marcus at promotion, 2/3 through the game.
Marcus VS. Kent
Marcus has:
3Str
3Skl
5Res
5Luk
Kent has:
2HP
4Spd
1Def
Con is tied.
Sain's lead was shaky, and Kent's case is even worse. Sure, he doubles some stuff that Marcus can't, but Marcus can one-hit most of the speedier enemies with axes and has the hit to overcome WTD. Marcus also compares very well defensively.
Winner: Marcus
Marcus VS. Lowen
Marcus has:
4Str
8Skl
5Res
Lowen has:
6HP
1Spd (Not even)
6Def
2Luk
1Con
Another shaky proposition. Marcus' offense destroys Lowen's with his Axe-ability and higher strength and hit, while Lowen's defense is much better. I'll give this one to Lowen though, because his durability leads are very prevalent.
Winner: Lowen: Passed Marcus at promotion 2/3 through the game.
Marcus VS. Isadora
Marcus has:
6HP
4Str
6Skl
3Def
4Res
5Con (!)
Isadora has:
5Spd
1Luk
Wow. Isadora just got smashed (Not saying much, but still). Marcus' AS and dodge are the only things he loses in, but look at that godawful Con of Isadora's. That makes either her strength go down the pipes (We're talking another 4-5 strength) for using iron weapons vs. Marcus' steel or killer weapons, or her speed and dodge lead dwindle to nothing. Marcus has an outright offensive and defensive lead here.
Now, it looks like we have (Basically) a 4-way tie for best paladin. Marcus has the hit and plays Speedy/mage-killer, Kent's the quick one, Sain's powerful, and Lowen can take a hit. Even though it kinda looks like Marcus is the odd man out, he's actually the most powerful of the bunch. Why?
Weapons.
Take a look at Kent, Sain, and Lowen's level. They promoted. Marcus did not. They cost you 10K in funds rank. Marcus did not. Therefore, Marcus gets killer and silver weapons to compensate (What one unit gets, the other gets as well), while Kent, Lowen, and Sain are stuck with iron (Mt deficiency), or steel (AS + Hit deficiency), while Isadora's basically restricted to iron (Con). So, Marcus basically has the most Mt by a huge margin, a good bit more crit, and in some cases, hit/AS. The gap has widened, Marcus is the winner. Again.
Marcus is still the best paladin. 2/3 of the way through the game.
Final summary:
All three of the cavaliers (Kent, Lowen, Sain) finally pass Marcus at Chapter 29 (Cog of Destiny), and it stays that way for the rest of the game. Marcus is by no means a bad character to use through the final chapters though, and if it weren't for a few speed issues, he'd be one of the best characters to grace Fire Emblem.
Even though the five chapters that Kent, Sain, and Lowen are better than Marcus may be 5 of the hardest, Marcus has the virtue of being the best character, period, through the first half or so of the game. None of the other paladins, at average stats, can say the same for any point in the game. Marcus' utulity throughout most of the game is unparalleled, but most people just don't realize what kind of a character he is fighting alongside your army.