You may or may not be better off. How will people that are/aren't part of a union be treated if some people are members? If majority is union and you are not, will you be shunned, denied same opportunities for promotion, etc? We can only guess.
Don't you have employment contracts? People will, at least under rule of law, be treated according to their contracts and your country's employment law??
Does your company currently investigate who you've spoken to about your job and seek to punish you for representing your better interests?