Mtb Frame question.........?

I am buying a new mountain bike and i have a question about the frame. The two bikes i am looking at are, Cannondale F5 and the Jamis Durango 1. Here is the description of the two frames.(Cannondales)Trail SL, double ed, mechanically formed, 6061 alloy and (Jamis7005 triple-ed aluminum main tubes, over-sized seat tube, sloping radius top tube, box-section down tube at BB, zero-stack head tube, over-sized stays, replaceable derailleur hanger).Please help me out. Thanks.