The thing is yes you should run it on the Intel. But if you are using a Sata 3 SSD it should be on the Marvell on that board.
If you had a board that was newer and had both sata 3 port on both controllers. Then you would see better #'s. Yes you would run it on the Intel.
That board was one of the first boards with sata 3 port plus not the greatest one too. Yes you can run it on the Intel ports but it is going to run at sata 2 speed.