Bloo is a lot more intrusive with its notifications, with the beeping for each one. I suppose I might be able to turn that off, though. I just close out of Bloo whenever I don't want to be actively engaged in FB fun. The one shining advantage to Sense's FB app is the photo viewing. I actually jump between three means of communicating with Facebook because no one way meets all my needs.
HTC Sense: Best photo browser with pinch-to-zoom, but doesn't show photo captions or allow interaction. Syncs birthdays and events with my Google calendar, which is good, imho.
Bloo: Only way to tag people in photos without logging into the FB desktop version on the browser. All the information is there, but navigating Bloo is a lot tougher than navigating the plane-jane FB touch site. Otherwise, this is the app that does the most.
FB touch site through browser: This is really underrated. It runs much faster than Bloo and can do all the same things except post notifications and tag people in images.