How far will Omani Arabic get me?
ٱلسَّلَامُ عَلَيْكُمْ
So, I've been interested in learning "Arabic" for a while. After doing some research, it seems very clear to me that effectively "Arabic" is about as much of language in and of itself as "Chinese", if not less. So, I've of course had to try to make the decision as to what I should learn. It's hard to say what's more useful, so I kinda disregarded that criterion entirely. I'm going with the dialect that has the most cultural significance to me, which is Omani Arabic as I have East African heritage and am looking to learn Swahili as well, so it'd be helpful to learn two languages that have a large vocabulary overlap. I've heard the Khaliji dialects are the most similar to MSA, and Omani specifically is one of the closest to Classical and Quranic Arabic which is nice because I'm hoping to read the Qu'ran one day.
My question is though, how well can I use that Omani Arabic across the Arab world. To ask more directly, would somebody say Omani Arabic is about as similar to the other Gulf/Peninsular dialects as European and Brazilian Portuguese are to each other? I know they're "highly mutually intelligible" but that kinda doesn't really mean anything to me. I want to know who I would be able to speak normally and be completely understood in like 95% of everyday situations.