For what it's worth, I am no where near any of the other people on this forum, but for everything I have played around with, quad tracking has become my go to. I have started playing around with two takes (left and right) with two guitars (four takes total), and then either using different amps or different channels on the same amp for each guitar. It lets me blend amps/cabs without having to worry about mic/amp phasing issues of only having two takes, and since all four tracks aren't the same tone, it keeps the other phasing/washy issues out of play (with my experiences) so you just get performance variation.
And I think the phasing/washy issues come from four takes with same guitar/amp/mic/speaker/cab accentuates strong points or peaks in the amp/mic/speaker/cab, which causes them to inadvertently blend to perceived mono. When I do mid/side Eqing on my master bus, it seems that two guitars/two amps/four takes have a lot less middle information jumping around than when I was doing one guitar/one amp/four takes, even with the same stereo separation chain.