Interesting timing on this thread.. i was just comparing my weber legacies (which for all intensive purposes are/were essentially the M75) with my RI greenbacks and i would say the Greenbacks def have more top end and crunch. I have been going back and forth and on it's own, ya can't beat the greenback. However, the darker voicing of the M75 and it's wattage handling for me made it better for recording a 50 watt amp. I can better contain the sound of a single speaker vs. 4. Furthermore, you can get an sm57 right on the cone and get some great tones where doing that to a RI is going to get you one hell of a bright tone. So greenback overall in a 4 x 12 but i am digging a weber / sm57 with a eminence super V / cascade fatheadII combo right now. Full crunch.