XTC Composite 29er 3 (2013) - Bikes | Giant Bicycles | Canada
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For me it's a no brainer, I'd take the Marin. I don't even think it's close.
The marin is a better value, but do you want a 26er or 29er?
2012 Pivot Mach 429
2010 Cervelo R3 SL
Test ride them if you can. When I tesr road the XTC the 71 degree head tube angle was to twitchy for me, but that depends on your riding style. Ride a Scott 930 or 2012 Expert for a bike with a slacker angle-- Trek X-Cal is another.