Both seem very reliable. The H & S will allow custom tuning vendors like KEM access to their platform. Spartan has a very nice platform but you only have access to spartans tunes. No outside vendor can tune on a spartan. I went with a SCT TSX with IDP custom tunes. IDP, KEM, Elite, and RCD all tune on the SCT platform. Best of luck with what ever one you choose has to be better than stock. Jason