I personally like any of the Japanese furniture, the astrology sets (both zodiacs) and the gorgeous series. I personally dislike the modern, striped and blue series (you need to be more original than jus adding one pattern to a series).
hmm I must give some advice in saying that some sets look much better when 3d is on! it was very noticeable with the balloon set for example, give it a try
Ahhhh, don't make me pick faves D:
but okey, I kinda like the classic (because it goes with the cafe set really well), blue, green, the fabric-styled furniture with no set, eh... usually I like to pair things up with other things, so I really don't have a particular favorite set.
I can say, however, that the lovely set is anything but.
I guess in order my favorites are minimalist, apline, rococo, and possibly Classic.
I know for sure my least favorites are balloon, lovely, kiddy, and sleek.