If there is to be a sub panel out there because you want more than one circuit, then I would think you will need a main breaker in the panel, otherwise you would be running more than one wire back to your house.
I think it is proper to run one larger wire out. I don't see how you will need more than 50 amps out there unless all your tools are running at once with lights, compressor etc.
wire size has to go by the amperage you choose I know that.
How far from the house is the shed?
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