I tried both and bought the Quest. I am not as big as you, but got a Brooks seat, nicer wheels, and Ultegra for both deraileurs. 105 across the board and I love the bike. Riding up a long steep hill three weeks ago, I came across a guy with a brand new carbon Trek whose RD had broken off at the plastic joint. Unhappy guy with a cell phone and a serious warranty claim. Steel is a tough product. Try them out, and buy the one you don't want to give back.