This isn't really answering your questions, but I've tried Vintage 30's, G12K-100's, G12H30's, Scumback M75's.
And combinations of V30/G12k-100, G12H30/V30 in 2x12 cabs. I couldnt try a M75/G12H30 combination which I bet would sound great.
But my favorite so far has been the G12H30/V30...