What you are saying is exactly what Larson said. Larson's exact quote is below. Yeah, it was a little over-the-top braggadocios, but I do think Larson would make the transition to open wheel easier than Verstappen would coming to Nascar.
"I know in my mind I am better than him as an all-around driver. There’s no way he can go win the Chili Bowl. There’s no way he can go win a Cup race at Bristol. There’s probably no way I can go win a Formula 1 race at Monaco, but I think I’d have a better shot doing what he does than him doing what I do just because of the car element. That’s what gives me ease and confidence that, like, I know I’m better than him. Maybe not in an open-wheel IndyCar or Formula 1 car, but that’s one discipline. I think I would beat him in everything else. You can quote that."