I'm with HBMTN, keep them whole as long as possible. This does to things, conserves heat and keeps moisture in the butts. Once exposed to air both are lost.
Team: Pyle's BBQ; Good-One "Trail Boss" 60T; Homemade rig; 22" Weber Kettle w/rotisserie ring; Big A$$ Rotisserie; BGE-Small; Weber Kettle Gold, Weber OTS, New Braunfels offset smoker.
Saddles BBQ Bistro