I use actual logic, instead of making it my username and spewing fanboy arguments. I find many of the biggest posters(not all but many) IE people who have like 10,000 posts+ are often huge fanboys that are rarely logical. Like I said its not all but some. They know who they are, and they are in denial if they don't think it's true.
Typically i like to see actual manga evidence for something. I will accept "what if" scenarios for what they are. "what if" scenarios. If it isn't something that is proven by the manga then it's still a theory, whether i believe it to be true or not, if i have no proof, i will explicitly state that it's possible I'm wrong and it's a theory that I have.
Feats are part of the manga, but don't really prove anything in versus threads.. We don't know what prime hiruzen is and we've never seen Hashirama's full abilities, though, we can assume that Hashi is one of the strongest of all time because Madara gives him praise, and madara is currently the most powerful Shinobi we've seen.