Wanting disc brakes. I found a set of Marta sl carbon complete with extra lever, caliper, discs and service kit. Also found a complete set of mt6 with discs. Both close in price. Which one is the better buy? From what I read both are good brakes and both would be fine. Marta sl being an older style with a good history of reliability and the mt6 being newer and supposed to be a better model but doesn't have the history of reliability.