For this part of your health application you will want to enter your home address! This is the location that you consider yourself a resident of. It will be the address where you pay taxes, are registered to vote, or maybe where you register your car. It also must be the city/state where you spend the majority of the year.
If your residential and billing address are the same, then yes, use that one!
You health plan information, including options and subsidies are decided based on where you consider yourself to be living the majority of the year so it's important to be as accurate as possible!