What's the difference? What's Bloo's weakness?
No widget for the wall posts like the official facebook app and babbler have, the friends list doesn't show pictures of your friends, so if you're like me I have a few friends in a couple states with same name. I have to remember which is which in what what order etc.
Annoying to set up, you have allow access several times to do certain things but once it's done it's done.
Babbler has a bug with the pictures. You can't view them. So if foce closes.
Bloo has never forced closed once.
Try them out see which floats your boat.