While Red Bull has demolished the competition in 2023, its RB14 winning all 12 races so far, Horner thinks Verstappen's dominance over Perez and the ease with which he executed his eighth consecutive race win shows F1 is witnessing "once in a generation" displays.
"I think there was superiority over everybody at the moment. Generally, it has been outstanding," Horner said.
"And what we're witnessing with Max at the moment is something that you see once in a generation.
Asked what Verstappen, who is marching to his third consecutive drivers' world championship, can do with the Red Bull that Perez can't, Horner replied: "Like all the great drivers, he just has that extra capacity.
"What we're witnessing and seeing with him at the moment is his ability to read the tyre, to read a race, to extract absolutely everything out of it.
"It's great to see. I think he's just at the top of his form at the moment."
Source: Autosport