what diff is better?

[OneKiwi]

I got a couple of xxxcrs and have had the ball diff from the start. I ended up getting some spares and there is the other diff sort and the diff casing has RTR on the side.

My question is what is less maintenance?
Is there any difference in performance?
Whats recommended to have?

appreciate a quick reply please

actually found this after posting.. hope this thread may help others
Yes sorry I did post B4 i searched i just realised as it may be covered here already