Anakin may have more raw force power, but all in all i don't think (force-wise) he's more powerful than Obi. Want proof of this? When they duel and both try to force push each other at the same time....remember the result?
As for the lightsaber fight, none really dominated the other in the fight, so yeah, i'd say they're pretty much equal. However, Obi Wan's Soresu would win again IMO. Anakin would get over confident and make another mistake, and Obi would win again.
~wickerman~