I don't know the bikes and don't feel like doing research, but a basically new bike vs. a 7--year-old bike? And an MTB, which tends to take a lot more abuse? The old bike seems like a great deal until the shocks start leaking and the wheels explode. (I actually have Chinese CF wheels on a road bike, and have had no problems .... but as I understand it QC might be spotty, and MTB wheels can take some huge hits (which I why I am glad I have Industry 9 wheels on mine.))