Just spent 3 nights at Bryce. Currently both North CG and Sunset CG are on 1st come basis - they stopped taking reservations 5/31 as they will be paving both CG's at some point in the not-too-distant future. No issue getting a site for us. If you are just windshield viewing then 1 day is fine. If you plan to do any hiking you will need at least 2 nights there. Parking at any of the viewpoints near the Amphitheater is next to impossible - take advantage of the free shuttle bus. Sunset CG is better situated if you plan to hike.
