A FlyerTalk Posting Legend
Join Date: Jul 2002
Location: MCI
Programs: AA Gold 1MM, AS MVP, UA Silver, WN A-List, Marriott LT Titanium, HH Diamond
Posts: 53,006
I'm with GoPhils: book the newer one. Although from looking at the Marriott site, it's entirely possible they were built at the same time. (They're in the same place.)
Solo travel, probably go FFI. Unless you think you'd like the larger layout with a sitting area and mini-kitchen.