22 diff. to balls it or gear it?

[TARTMAN]

I have been running my 22 for a couple months now and need to rebuild the diff.
I am wondering about the plus and negatives of the gear diff?

I have heard that there not great in the wet/slippy conditions compared to the ball diff.... Also, the rtr22 diff comes greeced and ready to fit i am told, but also people mention diff oil of various grades. Can someone explain what is best etc?

I have a spare 22, so am thinking maybe running one with gear diff for the dry and one with balls for the wet. hmmmm..

whats my options and what do you guys recommend?