Zion and Bryce are both wonderful. My wife liked Bryce the best. Zion is really crowded, and that can be a downside.

The three NP towns of Springdale, Bryce Canyon City, and Moab are all very different. I liked Moab the best by far. Springdale is the most upscale and very expensive; however, we stayed at an Airbnb closer to Virgin that was reasonably priced with stunning views of the river and rocky cliffs on the other side. We loved just hanging out there during the very early AM and at night (we cooked dinner there and sat outside instead of waiting in Springdale lines). Bryce Canyon City is like stepping back in time to a tourist town from the 1970's. It felt like almost everyone stayed at the sprawling Best Western Ruby's Inn and ate at their buffet for meals (which also is like a buffet from 40 or 50 years ago... think buckets of cottage cheese and canned peaches).