The "butterfly" air wrench is a waste of money. It is too easily triggered in my opinion.

Y.M.M.V., of course but I prefer the control of a positive moving switch.

SK is a decent brand but pretty soon, working at it professionally, you'll become a "tool snob" like the rest of the professionals.

Tool storage? Matco or SnapOn. Matco's are less expensive but still high quality. A collection of tools quickly becomes HEAVY and the cheaper boxes collapse and warp.

Heavy duty stuff? Look for OTC.

Klein, Ingersoll Rand, Chicago Pneumatic, Central Tools are all brands you will be getting familiar with.

One rounded bolt/nut on a customer's car negates any money you "save" on a bargain tool.

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“Whatever story you're telling, it will be more interesting if, at the end you add, "and then everything burst into flames.”
― Brian P. Cleary, You Oughta Know By Now