For SATA port, convenient, not need extrac $, better performance that compared to the lost cost pcie card.
For the pcie card, you need the best card to match the performance, sometime the PC can't recognize the pcie card too.
I recommend don't buy the pcie card for the SSD, even you have the only SATAII port, more info http://www.tomshardware.com/reviews/ssd-upgrade-sata-3gbps,3469.html