Snodgrass had a great shot from an angle, the Diame one was a quick build up followed by a nice shot. So for individual skill I'd go with the first, for the best team goal the second. Hernandez loved running in on goal and that's what he should have been fed more while he's been here.
No 4 (Abel's third) was a thing of beauty. I'd just pick Diame's above it, but still it was a great team goal.
How good is it that the main talking point of the game is which was the best of the six goals? Diame for me, just for the build up play, Snodgrass' goal was great and Abel managed a hat trick without a poor one.