I currently have a Bantam BC6, and I love it. I've used the hyperion a few times before and didnt like it as much. The menus werent as intuitive, but reading the manual would help (yea... that thing they inclue that we never read
Another cool thing about the Bantam is the lipo storage function. It charges or discharges the lipo to an optimum storage voltage. I'm not sure if the hyperion has that... don't remember off the top of my head.
Overall I think you would be happy with either one. I will say the bantam charger does look cooler though