I was going to say LDS and U of U. If you want to go to Provo, Utah Valley RMC is pretty good. Course, I'm partial since I used to be a Volunteer there.

         Each hospital in SLC has different success rates for different procedures. LDS Hospitals scores well on key goverment quality measures and patient satisfaction. U of U's scores aren't as high, but they also deal with the most complex cases so their doctors and staff are probably the most experienced in SLC.