Vision is definitely my favorite here. He'll likely phase through Wolverine's claw strikes and solidify his hand in Logan's brain, ending the battle in the first few seconds. Wolvie will heal, obviously, but he'll be out long enough for the Vision to gain the win.
If this is to the death, then Vision simply incinerates Wolverine with his 30,000 degree eye beams.
I'd like to see the first scenario.