Bully's are way stronger, WAY stronger. Bergs need berg offset wheels, bully's use axial offset wich is the most common offset. Bergs snap the stub axles off like they were plastic! Bergs turn sharper stock though, but wich a very little amount of work you can get the bully's to turn very sharp. Bergs are alittle easier to setup but mainly just because you kinda need side bent lower links so you clear the motors/cases on the bully's. But I know someone who could make you links
I loved my berg setups alot but I wont ever go back to them. The bully's are basically bullet proof. I have no idea how many stub axles and 3rd gears I broke on bergs, but enough to add up very fast! I have not broken anything on my bully's and I beat them.
Both need something as far as a steering kit, EEM has
this one for the bully's. Easily the most complete kit available. Also keeps your horn out of the way from snagging rocks.
Id reccomend bully's to anyone. Some people say their too heavy but they have them in cast versions now wich makes them hella light! Mine with cast rear tubes and case and front cast tubes with machined front case is at 5.13 lbs, wich is light enough for sure.
Bully's run very good on 35 and 45t's too, alot faster than bergs with the same setup and wheel speed is such an important thing to have. Mine hauls ass on handwound 45's and 4s.
Remember RCNT vendor EEM has the
SNG chassis wich is a perfect match for the bully's.