Professionally, I'd choose the guy on the right. Not to disagree, you do have to dress the part. But the guy on the right has hearing protection, protection from the sun for his eyes, is running the Exmark with the safer-for-your-hands ECS controls. Plus he looks like he might have done this before.
Personally I don't care if he chooses to get a little sun. But he does have that swirly lawn pattern going on though.
And I'd bet every woman on the block could describe the half naked lawnmower man. So maybe that is part of his "uniform".
But don't go out there thinking you're invisible. You got to dress to your customer's expectations. They're always watching.