tried both with the same cut (maybe I should put this under both headers LOL). I aways wanted to do a good 'Baltimore pit beef'. but with my gas grill, it never worked out right. so this is what I tried. I bought a piece of bottom round from the Sam's, maybe 4-5#, put in on the Traeger, not so much for the smoke as the slow cook, at 225 for around 2-3 hrs.
then I put it on the gas grill, set as high as I could get it 500+, just to char the outside a little, left it on there until I thought it looked done enough on the outside. I sliced if for sammy's. Came out pretty good. It does have a little smokey flavor to the beef, but it was very tender, sliced okay even though it was warm. A good horseradish sauce made it great!
final product here, after I eat about half of that SOB!!