I own an AM32 and have shot the Maxxis several times. To be honest, IMO, the draw cycles are nearly the same. Some say they feel a vibration in the AM32 after the shot, but I have never felt that myself. I believe those that are feeling any vibration at all out of the AM32 or the Maxxis are shooting bows that are not in tune.
Speed wise, they are pretty much the same as well. The Maxxis IBOs a whole 2fps faster. I will say that the Maxxis was a touch, just a touch quieter than the AM, but you really have to listen to notice.
Around my area the AM32 is between $50 and $70 cheaper, so there is very little difference even in price.
I would suggest spending some time shooting both bows, with both sets of cams (xtr and Z3), because changing the cams really affect the feel of both bows. I personally like the Z3 cams better, but it is very much a personal choice.