I like having players progess through the entire minor league system, with some exceptions. At the moment I have a team that's running like a well-oiled machine, so I can afford to let guys mature a little longer in the minors. But when I first started playing my team was a mess, so I had to rush some guys up to the big show. It's all a matter of situation and need.
In general, though, I like to focus on hiring good rookie league coaches and starting guys off there. The major exception with that is that if I sign an IFA long before the RL begins play, I like to start him at Low A so he gets extra playing time in, and I'll just progress him through the system at a normal pace after that.
You will find lots of other owners who like to always start great prospects at Low A or High A. It's a matter of personal preference. I just find that prospects consistently halt or slow development far more often if they reach the majors sooner than they should.