Older! But I really like the remakes.
-RBY are awesome, though I'm pretty sure I just feel this for nostalgic purposes, they are fun to run through super fast, totally flawed, totally awesome.
-GSC are my favorite, I just feel so immersed in the world, playing it again though, it is very easy. Level 50 in the Elite 4? Lame. I still like exploring everything though.
-RSE is pretty sweet. Cool little world to see,lots of hidden alcoves and items, charming graphics. For some reason I find these the most fun to Nuzlocke, but the least fun to run through normally just because of how the mechanics work.
-DPP gave so much to use competetive-wise, but was by far the most boring and formulatic of all games, really put me off Pokemon for awhile, until I learned about competetive battling. It has the same stuff as all the gens before it, but it just feels so calculate, not enough new stuff was added I guess, and Sinnoh is a pretty lame region as a whole to explore. I love the island that you visit post-E4 though.
-BW are pretty good as a whole, though I'm not a big fan of all the new Pokemon in BW, and I can definitely tell I'm getting older, because these games are way too easy. I have never beaten all of Black, but it is definitely not bad.
Note:All remakes are better than originals.