Green Onion Supply Oleophobic. Same oil resistance as the naked screen.
Second choice: Spigen SGP Oleophobic. Not as oil resistant, but still much better than regular protectors.
Some notes on the Green Onions oleophobic screen protector:
1- It has an incredible affinity for dust. I've never seen so much dust gather on my phone's screen before. Plus when I wipe it up with a microfiber cloth it ends up just being pushed around on the screen surface, it's virtually impossible to brush off or capture in the cloth.
2-The fit is not precise with too much gap left around the periphery between the protector and the screen.
3-It seems moderately oleophobic but I constantly have smudges all over it. In all fairness I don't seem to see fingerprints at all, just long smudges where I have swiped across the screen.