Single stage vs base clear: Persian white

Met with a guy today who may be painting by 67 Newport back in the original Persian white. We discussed single stage vs base clear.

He believes for this car single stage might be preferable. It can be more easily spot fixed if ever needed, among other things. He says he uses very high quality paints. Photos if his work look very good and he comes recommended by a few car friends. Been painting since 1981 (the year I was born.)

Any opinions on this?
Author: BluegrassDan