Generally speaking, the longer the bullet the faster the twist required to stabilize it properly .. not necessarily the reverse.
If you plan to use heavy for caliber bullets primarily, get a faster twist.
Nominal factory twist rates are built to suit the bullets most commonly used in them.
For eg , a .308 Win does not handle large for caliber bullets well and is usually twisted a 1-12 or 1-14. A 30-06 does handle the larger bullets well and has a normal twist rate at 1-10.
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When applied by competent people with the right intent, common sense goes a long way.
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