This should be posted in the General Computer Hardware and Software section, but we'll let the mods worry about that, hehe.
SATA is suppose to be faster than traditional EIDE drives. It can transfer rates of 150MB/s compared to 133MB/s of EIDE drives although speeds never reach the max anyways. The advantages of SATA drives is that the cable is super thin which help with airflow circulation in your PC (but you can get rounded cables too for EIDE drives as well). I don't see any disadvantages of using SATA drives. Some people have a hard time getting the computer to recognize it, but the motherboard should come with a SATA driver disk to help with the installation. I would say get the SATA because it's fast and new technology. It will get even better in the future as it plans to transfer data at much higher rate.