Interesting thought provoking article Olivia with some deep questions that touch on social conditioning, ethics and morals.
I sometimes think about this myself and realise in some ways we are constrained by language and understanding.
While I would not necessarily ask if one is better than the other, I think I understand the premise of your question, which I interpret as. Can you be monogomous and fully authentic?
I think the answer is yes depending on your values and as you stated in your essay, it centers around understanding your boundaries.
I personally think a lot of confusion arises around a lack of understanding of the types of love that exist.
I also recognise and value your statement around, "valuing my autonomy, and to center my own needs and wants." To me that is always personal choice and important and as long as it does not harm anyone, why not.