Yes - The standard TLR22 Diff Balls are called 'Carbide' but TLR do optional Tungsten Carbide balls which do last a lot longer than the kit ones.
I use TLR2951 3/32 Tungsten Carbide Diff Balls for the diff along with the TLR2947 Tungsten Carbide 2mm balls for the thrust race.
It makes a big difference to the longevity of the diff but even so, I would expect to rebuild and run-in my diff BEFORE every big meeting and the maximum I'd go between rebuilds is 2-3 meets.
The reason for this is that a smooth diff action is paramount to the handling of any 2WD car especially when you consider the power we are putting through them these days and the grip we have over here for them to react against.
I haven't used Ceramic Diff Balls for a very very long time but I know that some people swear by them.
It's your choice but IMO, no ball will last forever and as soon as it begins to slip or carve a groove in the plate then it will become microscopically pitted on its surface and soon after a rebuild, it'll begin to 'degrade' slightly quicker the next time.
Yes there are different grades available and I'm no diff expert but I would at least replace the kit standard ones with the TLR Tungsten ones - but be sure to do the thrust as well as the diff.
Please also ensure that you break-in your diff correctly. There are lots of threads here and everywhere else that explain how to do it and you will help yourself by doing it properly as the diff will be more reliable once set and properly broken in.
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