I have one of everything
I have an Ofna Hyper7 Pro w/ OS .21RZ-V plant but also a Kyosho FW-05RR (1/10th Nitro touring), and a few electrics such as a converted RC12L3 which is now a PRC Quad 12 1/12th scale electric. I had a plane, I have a boat, and an RC10GT and a Losi XXXT w/ brushless.
and ball diff's I was refering to was in the 1/12th. Ball diff's dont last long against nitro touring