Returning Pokemon gamer: which 3ds game recommendations

So I used to be super into the games of pokemon ever since the original GBA games, and I collected and went through every ds pokemon game till white/black version stopping with white on the dsi. I just purchased a 2dsXL and wasn't sure which 3ds title to pick up. Ive seen some posts about a year or so ago generally saying how x/y is better than the 3rd gen remakes; however now that ultra sun/moon is available already I wasn't sure on which to purchase first. difficulty doesn't bother me. Just looking for a decent post game experience, as well as a satisfying play through. Soul silver was my absolute favorite as i nearly finished the pokedex, and got a high trainer card color. so yea :)