Finding the best dental insurance is subjective. There is no one dental insurance plan that fits all. That is best for you depends on what you need, the current state of your teeth, the amount of money you are willing to pay for it, your out of pocket cost, your copayment fees, which dentist are available in your network, and whether your employer will kick in any money to help offset your cost or you have to pay for it all on your own. So when you go on a quest to find the best dental insurance policy you will find that what is best for your coworker sitting in the next cubicle may not be the best for you.
So write down what you want and expect out of the plan. What you are willing to pay. What you need in terms of preventative and remedial services and they compare them to the plans that you have in your state.