The center drive drivers might be a few ounces lighter.
Center drive: You don't have to cut the rails. The weak point is that when the track starts to slip you only have one anti-ratchet point to catch the track. This point is pushing on the raw edge of the center hole in the track. This causes damage on some people's track.
Clip drive: You have to cut the rails. Since there are a set of anti-ratchet points in each row of track clip holes, the forces of any slippage is divided by two. Also, the two anti-ratchet rows are pushing on steel track clips. The drivers will wear out before the track.
I've sold a lot of both types. It depends on how you ride.