VAC Avatar Super and Mc 2275

I'm looking to learn a little about the differences in sound between these two amps. They use similar tubes, have similar power ratings, and are both from admired companies.

Interested in 3 dimensional qualities, sonic signatures, attack, decay, etc.

I have heard the 2275 but in a bad room with a speaker that IMO needed more power B&W 803s. Familiar with Avatar SE but not Super.

Thanks!