Both! Nowhere do I mention min per lb or an internal temp. IDC if it is a 9 lb or a 20 lb brisket it gets wrapped after 4 hrs at 300 deg grate temp. and it will finish cooking in 2 hrs or less, it never fails.
I never met a Cow that I didn't like with a little Salt & Pepper! Certified PORK-A-HOLIC