Have you been using public transportation? If so, you know the pros and cons of public transportation very well.
Just from a personal perspective, I've used public transportation in the past, in a city where public transportation doesn't really go everywhere. So, I would ride, then walk.
I also have been in the situation of having to work were public transportation didn't go, and had to ride a bicycle to work.

So, I know all about public transportation.
But, I sacrificed buying a car, so that I could be in a better position financially later on.
So, I guess it comes down to what you want more. Do you want to try and make your business grow by investing money in it, or do you want to put it on hold for a while and have your own transportation?
Really, only you can answer which is more important.