Depends on when you will be driving to/from the games due to traffic.
Unless you will be driving during rush hour, there is only a few minute advantage to the KOA Campground.
However, if there is a wreck on the Mark Clark between you and your campground, then the KOA has a huge advantage since you can just take Clements Ferry road over to Hwy 41 and be close to the KOA when it hits 17, all of which is about the same time/distance as the Mark Clark. If you are at the Oaks, you would need to go over to Mt Pleasant, across the new Arthur Ravenal Bridge and then up 17, adding about 30 minutes to travel time.
By the way, most wrecks happen on the Don Holt Bridge which is west of Daniel Island towards Oak Plantation.
I've visited both campgrounds and think they are about the same, so I would go with KOA to be safe on the traffic issue. Besdies, you may find it's a great alternative and give you some new resturaunts to try.
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