New Leaf, but tbh I think the perfect Animal Crossing for me would basically combine the creative elements of New Leaf with the villager snarkiness and mechanical decisions (minus acres used as loading points) of Cube Crossing, with other smaller things added and improved here and there of course
Honestly, I can't pick between ACGC or New Leaf. New Leaf has so many things that other games didn't which makes it seem like the best game....but it's glaring flaws make it hard to saw it is without a doubt better than the original Gamecube version.
I've only played WW and NL, but NL is definitely better! I love customisation, landscaping, etc. so the choice is simple. I don't even know how I've spent that long on WW since there's just less to do by comparison. It's a pity they toned down the snark for a lot of characters though.
new leaf of course! I first started on the GameCube and while the music is much better, and so are villager personalities (more raw) nothing like acnl gameplay.
WW probably holds the most memories and thus the most nostalgia value for me, but in my eyes NL is vastly superior as a game, and the most enjoyable one to date as well.