Sure, some dentists are more talented than others. Just like some escorts give better bjs than others. Not everyone's the same. But don't kid yourself, these dentists went through rigorous testing when they were in school. I've heard some professors in dental school, are real knit pickers. If a student didn't do fillings and root canals the way the professors wanted it done, they'd have to get it perfect, or they'd get failing grades.
And yes, not all dentists have all the specialized equipment. It's just not worth the investment if a machine is only used once or twice per month. If you need something done that requires specialized equipment, and your dentist doesn't have it, he will send you to a dentist that has it.