The usual response is see what others are running at your club. The general advice I’ve seen is to get the front diff as close to locked as possible without actually locking it, since locked diffs are prohibited at my club.
My son’s car is on the standard unsealed diffs. I’m planning to put 500,000cst in the front as that should stiffen it up without leaking. Rear I’ll leave more or less open but might add some more AW grease. The thing with most grease options is they just get flung to the outside of the diff casing and stick, so the diff loosens up over time.