Jolida 502 or 801?

Hi everyone. I've been investigating tube integrateds and was considering the Jolida 502 stock or modified, as well as the 801a. I was wondering if anyone had compared these three options and could enlighten me as to the sonic differences. I know the 801 has a little more power but that aside what are the defining characteristics of each. Would I be better off with a modded 502 or stock 801 as they come out to about the same price? Oh and they'd be paired with Quad 22L2s.