My MSI Z97 motherboard (updated to the latest bios) seems to regard all of my bootable devices - SSD, HD, DVD-RW, flash drives - as legacy only. Specifically, if I switch to "Windows 8/8.1/10 mode", ...

I'm about to do a fresh install on desktop and I have a question about IDE vs. AHCI. Which mode should I pick in the bios? IDE, AHCI or RAID? Does AHCI have any advantages over IDE? My HDD right now ...