For me, it depends on what I'm cooking. If i'm cooking to "done" or by feel, it gets the high temp treatment. Pork shoulder, brisket, chuck roast ribs, all get done at 275 to 300. Same great taste/tenderness/moistness with better fat rendering and much less time. I do not do low 'n slow anymore.
If I'm cooking to a temperature, I back the temps down so I have a bigger window to catch when it's done, not because it has some magical effect on the meat. Pork loin gets 250. Pork tenderloins get 225 because they're smaller still. I cook standing rib roasts at 200. The massive size of these roast means it needs extra time for the heat to penetrate all the way to the middle, so the low cook temp helps that. I sear first, so no problems at all getting a nice crust. It gives me a very even edge-to-edge cook that is flawless for every one I've done.
Chicken is a bit of an outlier because I'll cook a whole bird at 275, but I also will cook individual pieces at 275. This is so I get bite-thru skin. I've found the secret to be the 275 temp, spray the pieces with olive oil, season and hold for 30 mins for the seasoning to soak up with the oil. Cook skin side down FIRST for 30 minutes, flip, cook ~10 mins and check temps, flip again if needed until IT of 165.