However, SM isn't all bad, and I've quite liked the episodes recently, since the Kanto arc till now. I personally thought SM had a very strong start, and I quite liked episodes 1 to 21 onwards. It was from then that I really got bored by the series. Episodes 22 to 41 was a long stretch of poor episodes, and the terrible Akala arc didn't help at all.
I don't want to comment on BW. I hated it from episode 1 itself, when they decided to reset Ash for no good reason, and make him worse than even his rookie OS self. I hated the companions as well, especially Iris. However, the early battle tournaments were pretty nice idea wise.
SM has been mixed for me, though slightly more negative than positive (I'd say 45% positive and 55% negative). I hate the school concept, since everyone is stuck on Melemele Island and can't travel. I personally don't care for most of the characters except Kiawe and recently, Gladion. And Ash, well I really dislike how much of a joke he is. Always running into unfunny slapstick humour and acting like a buffoon most of the time (thankfully he's still good at battling). As for less filler, yeah by sheer number, it may feel that way, but the problem with this SOL style is that most of these episodes just feel like filler, with maybe something important happening towards the end. So they still feel like boring, but important episodes.