Most people seem to prefer the ball diff.
The general rule of thumb is gear diff is better for high traction like carpet/astro but ball is better for low grip, but like I said, most of the top drivers in my area tend to prefer ball diffs for every type of surface.
I recently ran a gear diff & ball diff back to back (thanks to the shafts popping out on the DEX210) and I could tell straight away that the gear diff seems to push the front wider when putting some power down mid corner & also the rear snapped out alot easier when hammering it out of corners.
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