Out of 54 P5 qualifying QBs, Hall and Romney rank:
Yards per game - 19th | 38th (includes USU and ASU)
Completion % - 29th | 1st
Int per attempt - 27th | 1st
Yards per attempt - 30th | 1st
Passer rating - 30th | 1st
If he qualified, Romney would also have a higher QBR, which already factors in strength of competition.
Hall has the edge if he can run but if not the numbers and the eye test would suggest that Romney is a better pure passer.