Platinum was my first Pokemon game (I got it all the way back in Christmas 2009 with my DSi), and it still ranks as one of my favorites, it has a decent difficulty (way more difficult than Gen 6), and it had a lot of things in it that DP didn't (I never played DP) like an expanded Pokedex (finally more Fire Type variety), trainer battles in Pokemon Centers (yes that was a thing), the Battle Frontier (albeit not the one from Emerald), new forms for some Pokemon (Giratina, Rotom and Shaymin come to mind) and rematches with Stat trainers and Gym Leaders.