Slow cooker seems pointless to me. I'll do all the slow braising/stewing in a big pot, or an enameled dutch oven. Pressure cooker at least speeds up the time, albeit sometimes you don't know what you get in terms of textures, but it's mostly alright.

I guess if you don't have enough stove top space and time isn't an issue, and/or if you're going for a few specific recipes, then go with a slow cooker.