Not sure which bike to get
 

I ordered a specialized hardrock disc 29er but i came across the trek marlin 29 and i'm not sure if i should go with this instead. It has the 100mm of travel on the forks and an extra gears on it. Other then that i'm not sure whats better on it. Which one is more for the money. If i do go with the trek i have to cancel my order soon. Links below and thanks for the help.
http://www.trekbikes.com/us/en/bikes...sport/marlin/#
http://www.specialized.com/us/en/bc/...cname=Mountain