I am holding off on a maxx wondering if there may be a better deal before the 28th shared data kicks in. I have been happy with previous moto's and know the maxx would do well for the life of the contract but there is so much buzz around the S3 that I am starting to think about a preorder-figuring I can always trade to a maxx if the S3 radios/battery aren't up to snuff.
I don't think you can go wrong with either.
The S3 has a big battery, not as big as the Maxx but it is removable.
Other features have the S3 better. I own a Maxx but I just pre-ordered my daughter an S3.
I had a final upgrade and we are all unlimited so I used it for her phone.
She didn't want the Maxx and they way she can burn through a battery, she needs something removable so she can carry a bag of spares. (Music playing, games going, screen on constantly, texting.) She is the torture test for battery life on any smartphone.