No suggestions since I haven't had surgery and based on my very limited knowledge I don't see yours as being black and white as to the best way to proceed. With your size, unless your Drs. explained some particular urgency regarding your specific situation, I would say that you have time to explore the merits of the different types of treatments including "observation" which is called "watching and waiting" around here.
You are similar to me in that you are probably a good candidate for several choices. This can be frustrating on some levels because ultimately YOU will be deciding which way to go. Some find out that they have a tumor when it is very large. They only have one path and a relatively short period of time to get treatment. They are spared a lot of the stress about deciding how to proceed, but then they don't have any choices either.
I will say that I am sorry you have an AN. There is a lot of good info here and you will likely find not only people with identical circumstances, but that also live in your area and can rate their experiences with local Drs.
I can also say that dealing with the concept of having a tumor in your head will get easier over the next few weeks. You will become less anxious about it, even if you become more anxious in the short term as you read of the various complications that can come from these.
I've watched this video a couple of times. I think he is very articulate and thoughtful and the interview is very well presented. I find him inspiring because he focuses his discussion on his concern for his family. He tells it like it is regarding his fears, complications, and recovery, but what stands out, for me, is his concern for those around him, not himself.
https://www.anausa.org/component/content/article?id=314