I would put my (MTZ) sidewall up against a BFG any day though.
I agree, but the BFG sidewall is known to flex better, giving a smoother ride and more tire conformation to terrain, which increases traction. I think I recall reading that the BFG is also lighter than most others of same size and class/type of tire, which is good for gas mileage, acceleration, and braking. The BFG sidewall is tough enough for all but the most hardcore rock crawlers. For most offroaders the BFG sidewall is dandy.
One of those tires (MTZ or BFG) isn't better than the other. They're both good, but different offering different characteristics. The MTZ might be better for one guy, and the BFG for another guy. I do think the BFG MT is the better tire onroad (between BFG MT and MTZ) based on everything I've ever read, except your post. However, if you think the MTZ is better onroad, I won't argue with you. If that's your opinion I'm sure you have your reasons and your opinion is just as valid as anyone elses.
I do think the MTZ is the better tire offroad, and would be my choice for that. Except that BFG has more sizes, in particular it offers my favorite size (33 X 10.5 R15). So I'd personally choose the BFG because it's available in the size I want, but not because it's a better tire. They both great. Likewise the Cooper STT and Bridgestone Dueler MT are also great tires.
For what it's worth, the Bridgestone Dueler MT is underestimated and often overlooked. It's an MT that is great onroad, and I'll bet it's got a better price than any of the others mentioned in this paragraph. By contrast, I think the MTZ probably costs the most. The Cooper and BFG are more midpriced. At least that's what I've seen for prices in my local area at local tire stores.
That's ^^^ regarding mud tires
However, why not get a good hybrid tire? They're much better onroad than any mud tire and last longer. The best hybrids that come to mind are the D!ck Cepek FC2 and Mickey Thompson ATZ, which are closer to the AT than MT end of the scale, IMO. The Mastercraft CT which I personaly think it a bit more aggressive than the FC2 or ATZ, but still made to do very well on wet and dry highway while having a bit more mud potential.
An aggressive hybrid is the Cooper ST (which I have now). It does everything in mud for me that a mud tire does, and is also excellent on sand. It's good on wet roads too. It's downfall is winter conditions where it's mediocre/OK at best, even when aired down. However, I'm going to have the center treads siped and that should make it pretty good on winter roads snow/ice. However, I think that all the other hybrids mentioned in prior paragraphs will always be better on winter roads, and they're already well siped from factory so you don't need to add sipes. However, those other hybrids mud performance is mediocre/OK at best (better than an AT though). So ST is the best hybrid for mud and worst for winter, and good everywhere else. The best all around performer of the hybrids for mud, sand, and winter roads is the Mastercraft CT, IMO.
I can't say what's the best tire because it depends on your priorities, conditions, and vehicle.