for some reason i just thought i had read something once that the marvel 6gb ports were not very good but i guess it had to do with RAID which im not interested in.
Correct. The Marvell 6Gb/s controller is not as good as the native Intel 6Gb/s controller.
The Marvell controller uses only 1 PCIe lane. It was originally designed to RAID HDDs and for 1st generation SSDs. It can't perform at the speed of current generation SSDs.