OP. Not sure where you're located, but I have most of the amps being discussed in this thread here at my disposal. If you're within driving distance, you're welcome to come out and put a couple through their paces.
I think everyone here has done a good job at describing the differences and characteristics of each amp.
Friedman - Refined, polished Marshall tones. I own the 2016 BE100, Runt 50 and Butterslax. All 3 are fairly smooth amps. Like your ideal recorded Marshall tone vs an actual raw and roaring Marshall.
Diezel Herbert - I own the MKI and can't speak on the others, but these are compressed, saturated, liquid feeling chug machines.....in the best way. They will definitely have a hard time cutting through, depending on the situation. The right speaker, pickup and boost compliment and settings will get you there, fairly easily though, and there are some tricks to gettings the right frequencies out of the amp for live situations.
Mark III - Raw, Tight, tricky to dial in but should cut like a knife and punch you in the gut once you get it figured out. Boost it up front and play with the gains to really figure out your saturation. It's mostly a dry amp but can get fairly liquid feeling with the right settings.
Badlander - it is what they say it is. A modernized, rectifier inspired amp that's meant to be more tight and open than the older Rectifiers. Some love it, some hate it. I love it, but it's also a situational amp for me. Crunch channel boosted with a beefy guitar and cab and it sounds just right. For thrash. Can be thin if you're looking for a wall off sound type thing that a normal recitifer brings.