If ad copy is to be believed, one is a bass overdrive and the other is a heavy distortion.
Can you tell which is which?
I recorded a couple quick clips, first clean and then with one box and then the other. Not great audio quality (this is from my practice amp recorded by my Zoom H2) but interesting anyway. Both had a 2/3 effected to 1/3 clean blend from my VB-jr because they do lose lows (the HAO more than the Tech 21).
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The riff was off the cuff, just something I was playing around with when I felt like recording. If anyone wants me to record more clips with something a bit less sloppy let me know.