Ceramic balls lasts longer, but takes a bit of time to get to the sweet spot. They do tend to slip a bit more than carbide balls.
I've been using Ceramic all the way and it works great in the Yokomo diff. But they are more expensive than carbide balls. If you can get your hands on ceramic I would take ceramic, else carbide should be great too. If you do regular maintenance to your diffs there should be no better, only ceramic last longer.
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