I have both. And they're definitely in the same realm to me.
Like rockstarbassist said, a little more oomph in the HBE.
The separate preamp/boost switch in the HBE is very cool, and to my ears it doesn't just add a boost but a little color. You can use it on its own (which I do quite a bit to "warm up" other pedals, and my amp as well, it's solid state).
Love them both. For the sake of harmony and to avoid redundancy, I keep 'em on separate boards.
