I just did something I've never tried before. I A/B'd the Rumble 100 and 200 side by side, one at a time. I am surprised at the results. Although it's not my usual EQ, I first set every knob at 12:00 for an equal comparison, with the tweeter off for the 200. 140 watts into a 15, and 100 watts into a 12. The 100 was rattling things in the room more than the 200. The 200 had more highs. The volume was very similar. This is not at all what I expected.
Next, I stacked them and while plugged into the 100, I ran the effects out to the 200's effects in. the two amps worked perfectly together! One of the best bass tones ever with the knobs all still at 12:00. If I need more power than either offers, I wouldn't think twice about stacking them and running them this way. They work together perfectly!
In the end, I think either the 100 or the 200 could be EQ'd to sound pretty much the same as the other. And of course, we all know they are both stage worthy in their own right. They are both great amps. I just can't' believe how great they sound together!