Replying to Utah Vs Mammoth

Me and my lady are looking to spent two or three weeks in the US over christmas/new year 2010-11, and we've been looking at Utah and Mammoth. I like the look of Utah, both for the creativity in their park building and for the BC, but you cant deny Mammoth's sunny appeal, and their park seem to be pretty much on point every year. Then theres the issue of going relatively early in the season, will that be a problem in any of the places? Any advice would be greatly appreciated!