The brown test bike is , in fact, a real enduro. If it has the fox 36, and is in relatively good shape, snap it up for a good price.
If I were you I would go with the Enduro. It's relatively light for a "bigger" hit bike, but does XC trails really well. At your size, physics are working against you with the stumpy. Go with the stiffer and burlier construction of the enduro.
I'm 160 and I thought the stumpy could wander a bit at high speed downhill. It just felt really vauge. big fork tubes/suspension pivots/20mm through axle for the win.