I've smoked probably 20 butts this spring (for various charity lunches and a graduation party) and for the last 10 or so, I've trimmed the fat cap off with great results and the meat has been no less moist. Although it's true that I end up with less runoff to collect at the end, I still seem to end up with plenty to add back in for re-heating.
If you're in a hurry, there's no reason you can't leave the fat cap on, but if you like the bark as much as I do, I say trim if off.
If you're in a hurry, there's no reason you can't leave the fat cap on, but if you like the bark as much as I do, I say trim if off.
