Dustin,
welcome to the forum! I rarely post anything, but have lurked around for a long, long while and have learned a LOT from the folks here. I almost always finish my meats in the oven (or at least inside), as I feel it easier/ safer than keeping something flammable going out on the porch. I usually set my oven to 225f, and wrap the meat tightly with foil and set it on a sheet pan. I don't spritz or spray or anything else, and the meat is without fail very tender and juicy. Like everyone else, I take it to about 190f internal, then FTC and pull.
I have finished a few pork butts in the crockpot as well. I started doing it as a test one day, wanting to be able to take food to work for friends. I didn't wrap with foil or spritz/spray, just set it in there and set it on low. Now it does seem after a while to get more of a braise technically, with the amount of liquid that builds up in the crockpot, but it never seems to lose the little crusty bits that formed from the smoker (I like those), and actually seems to cook a little faster (I'm not sure what temperature low really achieves, but it can't be too far off of 225f). On occasion I've drained off quite a bit of the liquid (and melted fat) as it cooked out of the meat, then chilled it to solidify the fat and added the non-solid part back to the crockpot. I'm not sure that skimming the fat off really did anything helpful, but it didn't affect the taste, and it made me feel better that my food wasn't swimming in grease. With the crockpot, I take it to 190f, then set the crock to "keep warm" and just left it inside until we were ready to pull and eat. Now all that may be really getting quite a bit away from true "que", but it is a portable enough approach, and easy to do. My friends at work are all addicted now...
Hope this helps,
Laura