Well there is none. Gotta go with the old eye test. Gall hasn't shown weakness against these dudes, while Sage has against some better low-level dudes.
Stylewise, Gall's a purple belt level grappler and an aggressive boxer who can kick, while Sage's style is based on sport karate for MMA, more refined on the feet, and also makes mistakes on the ground (like going for the guillotine when doing so leads to giving up side control, and then he has trouble getting back to his feet).
So theoretically Gall is the aggressor in this and looks for the TD early, while Sage looks to maintain distance and find the right spot to kick or jump in with a punch. Gall will probably get a takedown and it could come down to if Sage can get back up.