Old job offered more pay after leaving, new job offered more to stay.

Basically what the title says. I left my old shop for a used car dealer that would pay me better about 3 weeks ago. Last week the old shop boss called me offering me a few hundred dollar a week raise from what I was making before. I tried to tell my boss I was going back last night and he offered me two more dollars an hour to stay at the new shop. I would be making about the same at both shops at that pay, but the shop I work at we only work 40 hours compared to the 55 before. What would you do ?