One trip only in Colo,UT or NM which one?

My family will be travelling around the four corners area the first 2
weeks of July. We will be taking one whitewater rafting trip (a
full-day). We have never rafted before but are experienced canoers. The
girls are ages 13 and 16 and both athletic so I'm not worried about
toning it down for them ( maybe a little for the out-of-shape adults) .
Can anyone comment on the following - scenery, difficulty level,
guides, etc.

NM
Rio Grande
-Taos Box
Rio Chama

CO
Animas
Dolores
Green

UT?