They're even. Guy can "win" with 8th gate, but then he dies too, so that's a draw. In fact, if Kakashi manages to teleport after Guy opens all the gates, it's Kakashi's victory, because Guy suicides.
As for the other gates, there are many ways Kakashi can handle them.
One, for example, is a raiton bunshin feint. No matter how fast Guy is, if he mistakes the bunshin for the real Kakashi and attacks him in melee, he'll get temporarily paralyzed which will create an opening for Kakashi. Of course there's a chance of Guy dealing with this bunshin with a ranged attack (Hirudora), which would ruin the plan, but hey. That's why I said they are even. Both have chances of winning.
Frankly, Guy admits that Kakashi is ahead of him, but he spoke of their competition which includes eating contests and rock-paper-scissors, so I don't think this should be taken as a proof of Kakashi's superiority.