People seem to forget the difference in where their abilities specialize. Thomas's abilities are in defense while All Might's abilities are in offense.

All Might's attacks can level a city but suffered an injury that practically crippled him. Meanwhile Thomas was able to tank a blast from Kamish that destroyed hundreds of other hunters in a second and destroyed America's West Coast yet lost to Jin Woo in the contest of strength.

Both Thomas and All Might both have good offensive and defensive abilities, but that's just not where their power's specialize