The Ultimate Guard boxes are much better than their Ultra Pro equivalents. My personal favorite - and a good box to get a bunch of, instead of just one or two - is the Deck 'n' Tray. I have a complete set of the released commander decks from WotC, and these hold a sleeved commander deck + tokens, and the tray has space for some spin downs, counters and other dice. Each box holds everything I need (or a friend needs) in order to play a game of EDH.
I personally really really like the Ultimnate Guard deck boxes. All these boxes are great for MTG decks up to commander/EDH size (not double sleeved).
Personal favoprite is the Flip'n'Tray box myself.
