No. 5 FSU More Battled Tested
As mentioned, the best team Oregon State has beaten is UCLA and they only played one game. The USC team they beat in regional play wasn't great and only had the No. 47 toughest schedule nationally.
When FSU played a Quad 1 team, they were in that upper third usually. They played and beat teams like North Carolina, Clemson, Florida, Louisville, Wake Forest, and Duke.
The ACC has proven it's on par with the SEC with five teams making the Super Regionals(FSU has beaten all four of them at least once). Oregon State did its best to schedule tough while not playing in a conference, but they haven't run through the same rigor, and why FSU has the No. 23 toughest schedule and Oregon State is No. 39.