What doctors do you  want to be able to see with your insurance?
What hospitals do you want access to?
What prescription drugs are you taking?
What is your budget?
What is more important to you, lower premiums or network/doctor flexibility?
How often do use your insurance?

Healthcare.gov is an excellent source for information. You can also sign up for coverage but I really recommend that you work with a local broker (like me) who is familiar with the health plans offered in your area