I have a sb2 mwbd coming in next week and some serious gas for an OFD while my funds replenish. I'm in the same boat as you though and plan on doing a lot of comparing and contrasting between the OFD>MWBD VS MWBD>OFD
Theoretically MWBD into OFD is maybe the most similar thing to the classical setup distortion pedal into valve amp. That being said, I think that comparison is very interesting and will make a similar thing with the BDI21 when I have a chance.

