Traya probably. Walking on a planet with gravity so intense it crushes the planet to its core and killing multiple sith assassins + 3 Jedi masters with a gesture is better than most what Jerec has done, though he did casually destroy a massive bridge and has parity with Darth Vader, so he possibly has more raw power.
In terms of Jerec destroying that bridge, according to the novel he was empowered by the Valley's power or something, so that feat doesn't really count in a neutral fight I guess. Plus I doubt Jerec had legitimate parity with Darth Vader, he was just close enough to be the next obvious choice if Vader died for Palps. I may be wrong on that point though.