well i think he was better than the two combined....the novel seems to clarify this:Years of training had gone into the preparation of Darth Maul as a Sith Lord. He had been more than the equal of the Jedi Knights he had faced and should have been able to defeat them easily. It was bad luck and chance that had led to his death, a combination that even the power of the dark side could. not always overcome. ROTS Obi-Wan could have beaten TPM Maul,but not a 13 years older Maul.by then Maul could have been Sidious' equal,i think.