Excellent question & topic!

Marquez is the better fighter but having to come up to Welter & his advancing age has me leaning towards Ortiz as the tougher opponent, plus add in Mayweather's inactivity

In saying that Marquez gave Pac hell twice & has proven his worth & is still one of the best counter punchers in the game & Ortiz is fighting Mayweather so it is always going to be an uphill battle for him...

Damn hard to say really when all the variables are weighed up... can I say 50/50?