New Leaf, although I haven't actually played either of the console versions yet, and there are most definitely some features from Wild World that I think are better than New Leaf, mostly how the villagers talk a lot more.
New leaf is my favourite game for certain. I love not only the gameplay and awesome features but alsk the amazing community.
Wild World will always hold a special place in my heart from playing it when I was very young. Thinking back, I like it in many ways more than New Leaf.
But also, I like that New Leaf puts you in the driving seat, and you can customise your town however you please=).
Population Growing definitely. I've been thinking about quitting acnl and only playing on my gamecube town. I still play it and idk, it's just more fun and special to me. New Leaf feels like a chore because of the dumb villager issues, it makes me feel like I can't take a real hiatus. I love how I can come back to my gamecube town years later like nothing ever happened.