I'm a bit of both types. I'll always wear my branded clothing for Customers and quotes are typed up on headed paper.
But the back of my van is a tip, and I rarely keep an area tidy whilst working. My motivation? Well all I know is that my satisfaction is derived from getting on with the job, and creating / fixing / finishing something. Tidying up in the middle of a job is just an annoyance that stops me using my skills to do something great!
My only saving grace, is that no matter how untidy, I can just about always tell you which pile of crap my spirit level is under!