I still love the regal series, especially in new leaf, it fits so well with the fancy exterior. I also like any set that has a luxurious or classic european touch to them and the exotic set (remade).
Mermaid and rococo are my favorites! But I also love the classic, alpine, regal, gorgeous and princess set. I like a lot of the sets actually, except the modern set which I think is quite ugly.
I am collecting the mermaid now, and I love it, but I feel like once I have the whole thing I will get sick of it and sell it lol. I really like the Gracie set, ice set & any of the seasonal ones, especially the snowman/halloween sets.
Each series on their own is okay, but their refurbishments are what make them shine. For me, it's a three-way tie between Tan Patchwork, Golden Cabana, or Simple Modern Wood. Can you guess my favorite color? (Actually, it's blue. )
Rocco it looks soo adventurous Ice, cabanna, cabin, alpine, modern wood, outdoor, fish... I like them quite a lot...
But lol, my favorite is the sloppy, because that's how I live!