You can ride fire roads all day long on the Roadie, ask me how I know. You can slam it into a corner just about as good as my Daytona. Only if you're going to get into serious off road conditions do I see a need for the XC.
I went with the Roadie because of the height. I'm a 30" inseam and was much more comfortable on it. And if you're ever going to haul a passenger sure footing is even better.
2015 Tiger 800 XCx