I've played New Leaf and New Horizons. My first was New Leaf and it's my fav. I used to constantly play it and then restart and do everything all over again.
I haven't played NH nearly as much, the game begins very slow and there isn't much to do if you aren't sprucing up your island. I like decorating homes but decorating an entire island is overwhelming and time consuming ^^'.
I'm interested in trying out Wild World and Population Growing because the villagers seem hilarious in them. The idea of like idk Rosie burning you and a few minutes later robbing you is really funny lol.
Oops, I should have written houses instead of homes lol. I don't own the DLC. I've played Happy Home Designer and enjoyed it a good bit and HHP seems like an improved version of it. I'd like to buy it someday but it's not top priority.