well I have 2 sets one for Utah and one for the Dunes.
Terra Cross for Utah, and sand stars for dunes.
what I would recomend is that if you go with one tire for all, the Terra Cross is a great all around tire, but stay at 25". I didnt I have 27" on my Terra Cross, and that is OK for the mountains and the extra clearance is nice, but that the dunes those 27" tires suck up LOTS of power! but the sand stars ROCK!!!!!!!in the dunes