If I can contribute anything: don't do a Ph.D. just because you're not sure exactly what you want to do.
It may work out in the long run (thankfully it did eventually for me), but a M.Sc. is much shorter, and you may be more employable with one vs. a Ph.D.
Although do what you feel, maybe just think of this comment if you're questioning.
(Also sorry, my experience is only in science)