What is the fastest option of RAID 0-5?

i have nvr set up a raid setup before, thus i dont know whats best, what all the diffrent ones are, or how to even phrase it when talkin about it. but mainly i'm tryin to find out what is the best configuration to do for a FAST system. PLS OJNLY INFO THAT PERTAINS TO HARDDRIVES. ty in adavance for your answers and corrections to aanything i've said wrong.