Really tough. I haven't tried a 20th shiva, but I have an xtc 101b, and a jp2c. I use both in my band, depends on my mood. If I had to get rid for one, I'd be pissed, they're both awesome amps. Both can cover a lot of ground. The bogner is a bit more refined, thr mesa a bit more pissed. Both can do screaming leads. If you're playing .ore aggressive music, I'd go with the mesa, but Either could be awesome.