It'd be pretty close. Both sides have quotes saying they're better than the other in both the Force and lightsaber combat and then there are quotes saying they are equal in both categories. You can try to sort them out date-by-date to figure out which ones are the latest and place more value on those, but it's a very close fight regardless.
They both also have the feat of contending with Darth Sidious, the specifics of which can again be argued to weigh the scale to either side, but the feats place them in he same league overall.