Not sure about being smarter; but definitely bigger ego.
We're all smart in a variety of ways - and we're all stupid as fuck in a variety of ways.
When it comes to keeping my emotions in check during a debate, well, I'm just a little better at that.
In that way, my emotions generally don't rule my approach to any given argument - and that's why I will appear to be a little smarter, because my source isn't tainted - which makes it a LOT easier to stay rational and on point.
Again, it's not by choice - just a natural consequence of what I've experienced in life.
It has nothing to do with a big ego. I have what you would call a secure ego. Big egos are generally based in insecurity - which is a problem I've never had to any great extent.
That said, most people have some measure of self-interest. I'm not exempt in that way, that's for sure.
These things are relatively easy to spot. The more people react against someone having a point - the more insecure they will tend to be.
If you have a secure ego, you generally don't need to be upset if you're wrong. You just concede that such is the case, because you understand that being wrong is perfectly natural.
Obviously, however, there's a difference between being wrong and then perceiving yourself to be wrong - but we're already approaching a level of nuance that's beyond the norm around here.