Would say the Big 12 but they weren't given the opportunity to prove themselves in the playoff. Ironically Ohio State won the title while simultaneously quite possibly not even deserving to be there over TCU.
Pac has been good for a while, Oregon, USC, Stanford. They've seemingly always had a team in the national spotlight, just no titles since USC. Wouldn't be surprised if Arizona becomes the next "hip" Pac school to compete with those 3.
ACC, outside of FSU, hasn't proven **** though.
Funny enough I'd actually say outside of Ohio State, what B1G team has shown they're worth a damn over the past decade?