27.5 or 29er

So. I am new to the world of MTBs; pleae be kind and forgive my ignorance. I've decided that I need my first one to be a Voodoo. I can't quite decide if I should get the new 29er (Bizango) or the 27.5 Hoodoo. Could please someone educate me and help me sort out the war in my head. :-(
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I prefer 27.5 because to me it feels more manourvourable on tight trails. My friends 29er feels too tall, but a smaller frame size would counteract that.
2013 Mondraker Dune XR - XX1 XO1 Hope, Easton Carbon, Fox
Voodoo Bizango XT - Hope, Pikes, Mavic