Three ways are quick and easy tools but very much a disposable item. I hate to phrase it like that but I have yet to find one aside from the one that smd4 mentioned (the original one) that is really a long term heavy usage tool. The more recent metal one they made was nice and the Soma Y Wrench is neat but not a super high quality tool.

For my it would be PB-Swiss hex wrenches or T handles (or Beta T Handles) or Wera or Silca beyond that I don't like to cheap out on those tools because they get so much usage. I also like bits and for my portable set I have PB-Swiss bits with a Snap On ratchet but a socket wrench probably makes the most sense for shop use and for that I would probably get a full Snap-On set and accept that it does cost money but a good mechanic would own their own tools which might be tougher at a Co-Op I realize but if you are a regular employee/volunteer then I highly recommend it along with a lockable box. When you own your own tools you take care of them more generally and you are less likely to get them taken or misplaced.

Keep in mind some of these companies are willing to help out co-ops and non-profits. I know PB-Swiss has free tool boards with requirements but it is a neat program. They might also be willing to donate sets or give a shop or bulk discount. Getting a younger person interested in wrenching and getting them started with tools is an excellent path to a great career and good knowledge.