It depends on what kind of ride you want. The M-10 will give you an awsome ride, many adjustment options, but no weight transfer. The Sc 10 will give a good ride, better wight transfer. If you are not racing, and can afford it, go for the M-10!!!!!
I have an M-10 on my 00' Mach Z and it is night and day differance from the SC 10.