Best Places to Practice in the US?

What are the best placees to practice medical dermatology in the US? Is the key metric to focus on dermatologists per capita or is there a better metric to get a sense of competitive dynamics? Are reimbursements basically equivalent no matter where you are in the US (not adjusted for cost of living)? Is there any database where you can get a better sense of dermatologists per capita on a very granular level such as by city or zip code?

Thank you in advance for the help!