>>24792898People will disagree but Gen VI has been pretty lackluster in my opinion.
This is my (obviously subjective) opinion on the games. Anything in "Good Tier" or above I'd say is worth playing.
If Red and Blue were the last games you played, then I'd either start with FireRed and LeafGreen (remakes of Red and Blue) or HeartGold and SoulSilver (remakes of Gold and Silver, which are sequels to Red and Blue; all the other regions are standalone, just to note, and can be played independently of each other). I recommend waiting for Z instead of getting XY.