It does beat the Marvell despite both chips still being limited to PCI-E x1 lane bottleneck. Primarily in the writes with reads not being that much better overall.
That chip's being used in larger amounts of devices these days and most upper end sata3 docks and external drive bays will utilize it as well. I have 2 devices using the chip but the main bottlenecks are caused from the USB 3.0 ports with their lack of UASP support. Onboard ASMedia ports don't suffer from lack of that ability and post 400+/300+MB/s speeds compared to Marvell's typical 400/250 limitation.
Still both crappy chips to run a larger capacity/faster 6G SSD though.