I would say if your primary home is your address I would put that address. However I have one question. Are you both naturalizing or just you? If it is just you I would probably do that. If she's naturalizing too there could be issues of which district she belongs for naturalization purposes. Other question (no need to answer, just for you to think) is that if you got your green card through marriage and you're applying for naturalization under the 3 years rule you might get asked about your marriage and have to explain not living together. Other than that I would say if only you are applying and it is a straightforward case as you put it I would just put your address as also her address. This is not legal advice or anything like it, just my opinion.
My 2 cents.