I plan on installing Debian 6 on my server build with a E3-1270, 16GB DDR3, and 2x120GB SATA3 SSDs. But this has me wondering, should I use Intel's built-in, on-board software RAID or the OSs'? Which will perform more efficiently? Which is simpler? Please give me a solid answer. Thanks!
I would suggest to find an Hardware RAID setup which is optimized for use with SSDs. AFAIK most SSD are RAID similar setups internal (connecting the modules in the frame and providing caching), which might perform slow on 'normal' (hardware or software) RAID controllers. Most (cheap) SSDs carry a JMicron controller, so perhaps you should focus on a decent hardware RAID controller for JMicron SSD devices, to improve life expectancy and read/write speed/caching on the RAID setup.
Unfortunately i've never reasearched this myself, but i know special SSD RAID setups exist..