The Tama-Go is a really nice version if you look past the size and quality, if buy buy a few figures, you will have a blast playing it, and get rich in gotchi points, also. Just beware, if you drop it on a hard floor, you, will get some dead pixels (I learned the hard way D
the Music star is also really cool, but if you get scared by sudden noises, I don't reccomend it. When it practices by itself, it beeps loudly, and it's not like an attention beep.
The V3 is cool, I think there are too many characters (I have a simple mind xD) and some of them are really ugly, but most are cute, it has a ton of games, too. Good version and also has a fun tamatown!
Eh, the v4 is......sort of fun, it gets boring after a while, mine is on pause right now. But the Tamatown to it is fun.
The iD is loads of fun! You can buy clothes, toys, go to the park and so on. There arn't any oldies on it so that's good if you dislike oldies and want to keep your character forever