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if you are painting in a sterile environment base clear will be a nicer finish but not be an original look.
in my garage i prefer single stage urethane, it is only one operation, spray the car and it is over. no worries about the time frame for dust or bugs to land on the base which will be magnified once the clear goes over it. if you do get a run or dust or bug the urethane it polishes up nice. if you get a scratch in the base clear it will show white, scratch the single stage and it will show the color of the paint, i have touched up a few chips and scratches with a small brush, fill in the scratch, let them cure then polished them flat and it looks good, i seem to be touching stuff up more now that im older. urethane will last for many years, probably longer than you will own the car.
single stage urethane works good for me and it is just is easier.