ok when you say maul you are referring to maul in TP< no further training no nothing jus how good he is in TPM because theres no telling how much better he could have gotten.
and ROTS obi wn is really good with lightsaber he's a form 3 master makeing him almost untouchable towards maul but if after thsi you still say nope maul would beat obi then you really are either ignorant or it's a lack of information.