He should play in the Champions League, and Havertz in the Premier League.
The Porto game was interesting because we couldn't execute our high press as efficiently as we have done against low blocks in the PL recently. This was because Porto's defensive players are so technically good. They all had a solid touch, could dribble, and were confident with the ball at their feet. The exact opposite is true for most PL teams who also play a low block, resulting in more mistakes and general chaos at the back. That's where our master of chaos, Kai Havertz, tends to thrive.
In more controlled games, like we saw against Porto, someone like Jesus is going to be better because he's stronger in tight spaces and better at helping us control the ball further up the pitch with his dribbling and superior technique.
That said, what a place to be, having Jesus as cover. We've come a long way.