I use both as well. The slow cooker, to me, is more versatile. The pressure cooker is a tenderizer, but doesn't lend itself well to building flavors. Most of the time, I use it to get the meat tender so I can use it in something else. Tongue might be the only thing that I've eaten straight out of the pressure cooker.
Here's an article written by J. Kenji Lopez Alt on pressure cookers vs slow cookers vs dutch ovens. If you're not familiar with him, he does a decent job of delving into the science of cooking. His opinion seems to be to use a pressure cooker or a dutch oven and in the article he has several side-by-side examples to back it up. Its not wild game specific, but I'd say the majority of the time its better to think in terms of what cut you're cooking and not specifically as wild game.
I gave up using a crock pot slow cooker. We only user the pressure style insta pot system now with all our game. Its amazing what It will do in a fraction of the time, and it basically falls off the bone its so tender.
I use both often, and my choice depends on what I am making. If it is a stew where the more tender the meat the better, I’ll use a slow cooker. If I am making a meat dish, where you don’t want it too tender, venison osso buco for example, but also don’t want to cook it for four hours, I use a pressure cooker.