The Guardian should be the most powerful of them all, but that movie sucked so much, I fell asleep, and never cared to finished.
Minus the Guardian, it should go like this.
Kane form 3. ****er had all those magic to help him supplement his sword skills. Connor had to forge a new blade to fight him.
Kurgan from 1. This beast was a straight power house that destroyed Ramirez. The same Ramirez at that time was only shadowed by the Kurgan. Also, at that time before more movies were made, Kurgan was said to be the most powerful Highlander. Connor and the Kurgan were also the last 2.
Katana from 2. Katana was good, he gave Connor a fight, but he was not that impressive. I liked him so well just because if Michael Ironsides.
Jacob from Endgame. Jacob sucked since most of his powers were him killing his own allies to get more power. I never felt he earned he them. Also, the reason Connor didn’t fight and kill him, was because Connor at the time was so tired from his immortal life, he purposely committed suicide against Duncan.
You should have added the Marcus Octavius from Highlander now he Quest for Peace. That film was ****ing phenomenal. I would say it equals the original, if not surpasses.