I had the BYOB alongside my 70.2s for a while. I thought it was more energetic, with more top end sparkle. But, I thought the presentation was more lightweight with significantly less bass. The 70.2s are more resolved, though in a quiet way. The 70.2s and probably 30 amps have much more drive.
Overall, the 70.2s are better amps. From recollection, I think the 70s are better as well. However, they are much more expensive.