Think of the three choice in this way:
IDE -- More compatible, though a little slower.
AHCI -- Good performance. Need to manually load the driver during Windows setup if you are using this drive as your boot drive.
RAID -- Depending on implementation, you may need to manually load the driver during Windows Setup. Fastest.
Ultimately, the choice is up to you as to which one to use.
I use Matrix RAID on one of my systems, and I like it. I get near-SSD performance from normal drives, and my speeds are faster than VRs.