You can't make a judgment on a preamp's sonics based on listening to each in two totally different systems. I don't know which is better; however, I did speak to someone who owned both, and preferred the Rogue in the end for being more musical & realistic in the midrange.
My suggestion: buy a R99 here on Audiogon, try it, compare it to the C2200. If you like the Mac better, wait for one to go up for sale, sell the Rogue for what you paid for it, and buy the Mac. Then let us know your decision.