re: Is joining a union the way to go?

your union pension comes from your dues, which you could invest yourself.

I would say it makes sense if the jobsite makes it easier on the union members. My experience is most people who don't join are ornery sorts.

ETA: And while the law says the union has to look out for all employees, even the non-union ones, don't expect them to do anything for you around disciplinary action by the company.