It's a difficult question to answer. It depends on budget, location, and personal research really. Some people believe some are more thorough than others, some vary a bit in price, some have more experience and a greater number of procedures under their belt etc.
If there was a one stand out place, I guess we'd all be going to the same one
You have to look into each a little and find which you feel most comfortable with. Maybe have a read of some blogs of some people who have been to the place nearest you? x