Both good tags and it is more of a coin flip, unless you know one unit better than the other. The success rates are better on the Book Cliffs muzzy tags. A lot less hunters or other people to deal with on the books and it is much more remote than the wasatch. To me, you may be able to find a higher scoring bull on the wasatch, but the books have a good amount of heavy 300-330 range bulls that are heavier and older bulls than what the average that comes off the wasatch.
There are some big ones on the wasatch and some on the books, but IMHO, more younger bulls come off the wasatch, on average than the books...