I missed this originally when you posted it, but -- it's a fair tradeoff. I would take a certified UD Johnny Bench auto over a certified UD Jon Jones auto (and I only collect MMA too) for the simple reason that UD's MMA market isn't all that strong since the cards aren't "certified" UFC cards.
It would be like pulling a Sidney Crosby autograph from a Leaf Sports product. There will be some market for it, but not much since it's not an NHL or hockey product. That Jones would probably net you maybe $30-35 tops if you took it to eBay, even in its hardsigned nature.
