Personally, I like the playtest's idea of 30 point buy, 3 points more than the official version. It's a flat 30, ending on a zero, and Pathfinder-wise, a happy middle point between the 15 and 20 PB options.
But alas, it's 27 in 5E. I think that the devs saw a potential 16 16 16 10 10 10 human...