I actually preferred the Crystal City Hyatt over the Grand Hyatt Washington.
Better room (nice view of DCA). Working internet (thanks to it being RJ-45. I could not get a wireless signal at GWA even with an atrium-facing room). Better food and better menu (GHW is really...funky...in their menu).
Shuttle from the CC Metro was quite slow, but the shuttle out to DCA was quite fast.