Honestly super fair re: bleeding out. I was considering the thigh there and forgot to mention my problem specifically with the calf, which would be chronic pain. I know that comes with getting shot anywhere and especially in the limbs (sort of Sophie's choice if you want to gamble on the distal or proximal for the arms), but I figure the problem for me wouldn't be potentially losing the leg as much as it would be feeling pain every time I walk due to the pressure. If anything, the shin protecting the tibial nerve makes it seem like you wouldn't be all that likely to lose sensation.

Fair point. I'd still prefer the right arm*, but I think you could reasonably debate distal or proximal. Proximal has less chance of hitting the brachial artery and surrounding major nerves, but if you do hit them, you're in bigger trouble than in the distal – where the median nerve and the brachial artery have split, making it easier to hit something but for that individual hit to be less severe.

* Another comment mentioned your glutes, which, yeah, fair if you could hit it from the side-on (and be fairly accurate, otherwise ouch, that tailbone).

The gut is notoriously one of the most painful places you can get shot. It's fairly "safe" overall with antibiotics and prompt medical intervention, although it would carry a higher risk of infection. Plus hitting a kidney seems like a pretty severe complication. So I think I'd rather take the arm.

Edit: Plus possibility of hitting the spine. oof, ouch, owie

Lol no. Very no. Getting gut shot is a wonderful way to die slowly and in agony.