My 6yo thinks the HBB is more comfortable but the backless is "cooler," so take that for what you will. He uses a HBB most of the time, mainly because he is much better at getting the belt fit right with it than with the backless (which needs the guide since he's small--if your child gets a good fit without the guide it's probably not an issue). With the backless I have to check it every time and about half the time it needs to be adjusted, so that's a pain. With the HBB, the belt stays threaded through the seat.
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