This is quite hard to say, as all of them were too hard for me, I couldn't really enjoy any of them at the fullest.
I can rate each game to say what I think about it:
Wonderland Adventures: I like it because of the nostalgia, how it also reminds of the story of WSW. It also is quite simplistic, which I like
MOFI: I like it because of the amazing graphics that cannot be beat by any way. It has new and amazing music, such as the Wonderfalls theme and Jungle theme. The adventures are much more interesting than in the original, however, the difficulty curve is just way too harsh. I also hate how the game ends, I think it just doesn't fit with the end of any Wonderland game.
POTZ: I like it, but it's really hard for some reason what is it about why I like it. The universe of POTZ is the best, travelling to areas that are so different from each other, in WA, you get only your classic areas. In MOFI, you get only the beautiful areas. In POTZ, you get both, plus completely new areas that were never made before, such as Barren and Uo. However, the game is very hard, and I don't like the fact that you are free to choose your own planet which one to play first, I prefer when you have to do them in an order. However, I just love the music, and the ending is simply the best.
If I had to choose one, it would be a close call between MOFI and POTZ.