I'd give it to Anakin. Anakin was more or less on par with Obi Wan, who should be stronger or at least equal to to the version of himself that beat Maul.
Phantom Menace Maul gets creamed. I wouldn't even put him with Kylo in TFA. He was trained to be an assassin and had little guidance in the way of the force, besides the basics. His training was primarily weapons and battle focused.