Tommy Hunter vs. Scott Feldman

Need some help settling a debate with a friend. He says Tommy Hunter has performed much better than Scott Feldman so far this year. I say Hunter hasn't pitched that much better (just slightly better) but has gotten a lot luckier so far (as far as the ERA and W/L of the team during the outings of each are concerned). Which of us (if either) is correct? What arguments/stats would you use to make your case?