Well, that's kind of like asking if all apples are the same. Apples come in different colors. Apples come in different sizes. Apples come with a variety of flavors.
So what apple is right for you? That depends on the situation. Is it a hot summers day and you just want an apple that will taste good? Or are you looking to make a pie and need an apple that is good for baking? The answer to these two questions would lead you to two very different varieties of apples. Yet they are both still called apples.
The same can be said for dentists. Every dentist has had to go to a qualified dental school to get his/her degree. Every dentist has had to take the same national examinations to prove that they are proficient at certain types of dentistry. Therefore, anyone that legally can be called a dentist is pretty much the same thing.
So what dentist is right for you. Like the apples, that depends on what you are looking for. If you want convenience then do an internet search for dentists and you can find the absolute closest dentist to you by mileage. If you want the cheapest dentist then call dental offices and ask what their cost is on a certain procedure. You can then find the cheapest dentist out there.
These factors are the easy ones. But what if you want a dentist that is good with kids. What if you want a dentist that has a good cosmetic eye and can not only fix your teeth but make them look attractive as well. What if you want a good bedside manner, etc. etc. etc.
These are some of the tougher ones. For this you need to do a little more homework. Go online and read reviews. Ask neighbors, friends, and family. Ask to see before and after pictures of work they have done. Ask if they have gotten any extra training in any particular aspect of dentistry. Ask if there are procedures that they choose not to do. Even though every dentist can do a root canal, some choose not to.
Once you have found all of this out you can choose which dentist is right for you. Last thing you want is to take a bite thinking you have a golden delicious and end up with a granny smith.