Sid nailed it. The only good margarita is made with fresh lime juice. That stuff in a bottle is sugar water garbage. But to answer your question it should be Patron IMO.
I have friends who love it. I wasn't that impressed. When it comes to food it usually boils down to personal taste. The lobster I had at Rudi's wasn't as good as the one I had in the MDR on Elegant night.
Usually the steakhouse bar has it on most ships. Vista is the only Alchemy Bar I've seen it at. I saw on CC that Pig and Anchor had it on MG. Please report back if this is true because we get on her the day you get off!😜