I like the Memetchi figure better than the Kutchipatchi one, because:
1: (You probably shouldn't listen to me knowing this:) I don't have the Kutchipatchi figure.... so obviously I like the Memetchi one better But I do know that there's a restaurant and you can play two games: Vegetables and Flag Game. I don't know what they're about. ^.^ (Also, the restaurant is Chinese.)
2: The Memetchi one has a shop with clothes that you can put on (but you can't keep it, it just does a little dance with it like in the connection versions). Which means it's interactive.
3: It comes with 2 or 3 games and the 2 that I know of are: Shapes (like the one on the v4.5) and Music note.
The figures that come with the Tama-Go all have the same content; just one game.
With the figures that are bought separately, however, I prefer Memetchi. Not only do I like the character Memetchi more than Kuchipatchi, but she also has a cool shop where you can buy items (Kuchipatchi's shop is just a restaurant and I find restaurants boring). Also, Memetchi's Music Note game is so much fun!
Like EMF said, the music note one is really fun!