I don't have either version of the game, but seeing how the 360 and PS3 versions of the game are near identical (apparently), I can weigh in a tad bit about it. The Wii version on the other hand, I haven't had any sort of experience with.
First off, battery issues:
I recall the PS3 having the same battery issues, though to a shorter extent (I remember Dark having said it lasted 12 hours). If you had an Xbox, I would certainly recommend that, since it doesn't require batteries, and it doesn't lag like the PC version. From what I've heard, in the Wii version, there can be a slight delay in the toy registering on the portal, and of course there's a bit of a graphical downgrade.
It really depends on your preferred system. I recall you having said that you aren't extremely fond of the Wii. Though I can't say much, since I don't have either version.
I'll link some reviews down below of the PS3 version.
http://cheatcc.com/ps3/rev/sky...ml#.TqjMkJt2KdE
http://www.psxextreme.com/ps3-reviews/537.html
http://www.gameinformer.com/ga...ers-review.aspx
So as you can tell, I'm recommending the PS3 version of the game, since it's probably the one I'm most familiar with, seeing how everyone is saying that it's almost exactly like the 360 version.
Buuuuuuuuuuuuuuuuuuuuut if you decide to get it for Wii and never get a game for the PS3, I'll gladly take it off your hands.

*shot*