Barkov is certainly no slouch offensively. He is much better at driving play up the ice and finding an open guy than Matthews is, and the advanced stats show he impacts overall goal differential more than Matthews does, which is the best barometer for the silly question you posed. So, yes he is, based on that stat. Can you provide evidence to show otherwise?
Wow, that literally has nothing to do with anything. Even Crosby fans aren't using head to head team results to justify him over OV. You can do better than that.
I am not in denial of how good he is defensively. Those two didn't even go head to head the whole series anyway. You are really grasping at straws to prove your point. It seems to fall apart when I think Matthews is good defensively, just not better than a proven Selke winner and far better two way player than Barkov. It is okay to have a reasonable take sometimes.