which is more powerful/fast

[SpEEdyBL]

The 380 motors have a smaller rotor than the 540 motors so they can spool up faster. You can also get more runtime out of them. I'd say the 380c 8t is slightly faster than the 8s. Honestly, I haven't seen any impressive numbers with the 8s. 30-35 mph is typical on 6 cells in a rustler or stampede and 40 mph on 8 cells. You would expect that the bigger 540 motors would be more powerful, but that's not always the case. I assume the 380c 6l would be the fastest of the bunch.