I use a variety of rings or one-piece mounts, on multiple rifles ranging from .223 to .308. I think either would be fine as long as they have good mechanisms to secure the scope, particularly on something with as much recoil as a .308. Another factor would be whether you need to add another 20 MOA to the equation. We just had to remove a one-piece from my son's .308 AR10. The scope was moving all over the place. We finally swapped him out to weaver tactical rings - problem solved.