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I would say Electrical, HVAC, Plumbing, or Cabinetry. The others are relatively low skilled and so are open to more competition. The trade with the most new innovations as far as I know is HVAC and that would have the least competition. Starting out as a general doesn't sound like a good idea to me. It would take a lot more schooling and he/she would be starting out with no experience working in the trades.
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