I expect it's more a question of technique than anything else. A good welder will get good results with a variety of set-ups, and a bad welder won't.
Furthermore, a good welder will get better results with a particular set-up than he would with another set-up, but another welder might find he prefers the other set-up.
You get the same thing with guitar players. In the end, it's in the fingers.
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