If you already believe that tax cuts spur growth, then you will believe that Donald Trump's debate performance on the economy is superior to Hillary Clinton's. If you already believe that government spending spurs growth, you will believe that Hillary Clinton's performance on the economy is superior to Donald Trump's. In other words, your prior beliefs will explain your assessment of who beat whom on substance. So why bother arguing about it?
On the other hand, Donald Trump made some theater mistakes. Funny how art is more objective here.