i feel like the normal resin break to easy idk if i should get tough, grey pro, flexible, modeling, or something i didn’t even list would do better
Flexible may be too rubbery; it isn’t the best for fine detail.
Tough is a lot more resilient than Standard resin, and is usually a good next step if you find Standard too brittle. But if you really want them to stand up to abuse, and don’t have too many fine details, try Durable. I’ve heard of prints in Durable surviving drops onto the floor (just don’t set your expectations too high - all resins are destructible).
If you’re using a Form 2, I also really like the feel and weight of Rigid resin (although it’s more brittle and likely won’t stand up to drops as well as Tough or Durable).
I think Grey Pro is definitely the way to go personally! Strong, looks good, and still relatively easy to paint.
It might also make sense to make molds, and cast out of a low-temperature melting metal.
To cast miniatures in pewter (or any soft metal) and preserve anything of the details, you would then need to invest in a spin-casting setup. Gravity-casting minis gives horrible results if you’re aiming for sharp details.
I’ve printed minis in GP and, while it’s not too bad, I might go with dental model, or durable, for a miniature. Only problem is that they warp thin details easily, so guns and swords might come out wonky… but at least they wouldn’t shatter if you dropped them on the floor or a hard counter.§