Currently fusion 2.5's event sheet is clunkier than construct's, but previews of fusion 3 show that clickteam is working hard to make the event sheet and code reusal way better than construct's current design.
Can you show me how are they trying to make it better? For what I've heard they'll keep the old event system. I was surprised by that, but if they do remake, I'd take a look at how they plan on doing so.