Lee trained more after Guy was injured making him equal , or past Guy's Taijutsu mastery.

Lets see here...... I’m assuming your going with a Teen version of Rock Lee as I see the picture shown above so I’m going to have to go with Might Guy due to the fact that he is more experienced in using 8 Inner Gates techniques and just overall more skilled fighter at the time then Rock Lee was.

If you went with a grown up Rock Lee who I am most certain that can use all 8 Gates then I would have to go with Rock Lee.