I'd have to go with white collar. I'm a professional that has to sometimes be mixed though. Sometimes the workers under me need a good knock in the head, so I've got physical labor there. I'd never really wear a white collar though as that would be tacky and could easily get dirty. Some days I'll wear a furry pink collar, a lime green leopard print collar, a purple feathered boa over a pastel purple collar...you know, anything that just looks really good and respectable. Can't look like a mess when you're running the streets.
Four year degree just to drive semi's, break them, and then fix em just to do it all over again. But for the last 4 months it has just been drive them so I don't even know what my tool box look like anymore. I think it is red?
My background is a heavy and eclectic mix of both... At one point, I was an accountant 3 days per week and managing warehouse inventory, driving forklifts and helping unload heavy machinery from semi-trailers the other 2...
Now I am in sales.
I am one of those guys that has a white-collar education and job, but fits in better with the boots-on-the-ground, getting-****-done "blue-collar" guys because they typically know what they need to do and how to do it best much more-so than their "managers."