Harbor Freight for the somewhat arcane tools that won't be used often enough to justify the cost of purchasing a Mac, Matco, or Snap-On equivalent. Disposable stuff like abrasives, fluids, gloves, stuff that doesn't matter long term. Ideally saving up and purchasing better tools (or used ones from marketplace or Craigslist) and holding on to them long term and taking care of them.

For electric power tools, I'm fairly convinced they are all made at the same plant, just choose your cult. I got whatever was a gift to start me off and then it's cheaper to stick with the brand than it is to migrate. Most people I know that use power tools commercially stick to Milwaukee or Makita stuff and it does well for them.