I've got a IMAX B6 and a Core RC UAC 50 (bought the B6 at a boot fair, week later won this on this forums giveaway, come to mention it, I actually miss the giveaway) and found that I much preferred the UAC.
All the leads you'll ever need, plugs straight into the mains, as well as being able to run off of a car battery (have not tested that function though), and I prefer the much simpler and easier user interface.
Just my 2 cents.