I'd say yes there is especially if you are trying to optimize for low-level, close to hardware features, like rendering performance and battery life, both cruci

I'd say yes there is especially if you are trying to optimize for low-level, close to hardware features, like rendering performance and battery life, both crucial on a phone. No browsing engine comes close to WebKit for those even on macOS. My best guess is that it would take a few years on iOS (at least) to get to the current difference that Blink/Geck have to WebKit on macOS, which is already considerable in favor to WebKit to begin with, despite being able to develop for this platform for decades.