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More chopped than burnt ends, I'd say. I'm not including the chains and places like Applebee's that sell "BBQ" along with everything else.
The long term established places (My Place and Mahylons in Muskogee, Oklahoma Style in Tulsa, etc.) serve both chopped and sliced brisket sandwiches. I can't recall any that serve a chopped brisket dinner. JL's in Pryor might but I haven't been there in years. I don't remember if they did 20 years ago or not. Wild Horse in Sallisaw (the best BBQ shack in the state in my opinion) is sliced only.
My buddy's place in Tahlequah has burnt ends on Fridays and Saturdays, as a special, along with chopped sandwiches and sliced dinners all the time. He's been making burnt ends for years though. I had them at his house probably 20 years ago before I ever had them in KC.
It seems like the newer the place the more likely it is that they serve burnt ends, at least around here.
Same as me, Okie. I'd heard of burnt ends, had no idea it was the entire point, and never eaten them. Sauce is same rationale as you: nothing wrong with it, mind you, but don't cover the meat with it until I've tried it. Let me decide if and how much.