I'm going to make two assumptions, that the graph is mainly concerned about:
1) Precision rifles, with precision optics (referencing the M14 in the post on TFL).
2) Killing living things, not just putting holes in paper (referencing the hunting and combat divergence).
So it seems that we're talking about the M14 in a designated marksman role... For that, energy transfer means a lot more than a slightly-flatter drop. I'll take .308 all day, every day.
EDIT - and looking at Hornady's factory loads, the 123gr AMAX 6.5 Grendel has 51" drop, and 881 ft./lbs. at 500 yards. The 178gr BTHP .308 has 44" drop, and 1554 ft./lbs. at 500 yards. Both reportedly from 24" barrels. So at least with those two, the .308 has the edge in every category, other than recoil