D600 vs. D800... which one is the most balanced camera?

better AF sensor (D600's AF sensor is more suited for DX, and I actually use the D800 AF sensor's extremities), better low light AF performance, better handling for me, 36MP files are better for manipulations (crops lose less resolution), and others.

for others though, the D800 may have too many unneeded features and the D600 may be more balanced.