Re: How to choose dojo if there are choices?
I would definitely agree with Jun recommendations. I would also IMHO its more about finding a good teacher than any particular style. By good I mean one that fits your needs- feels right to you. Also consider distance, allowing yourself the opportunity to train. Time management counts in this busy world.
I think Ron makes a good point if that's what you are looking for. I also found after years of doing "hard style" I needed to do something soft for a while to balance myself and gain another perspective.
I would say look for an instructor as you would a physician. Don't go because its close (although it helps). Shop around to find what you really want.
Just my two cents.