Servo's value is that it's written in Rust.

Ladybird is C++ and that still has the same issues as every other engine.

I suspect Ladybird will/has already leapfrogged Servo in performance and usage due to the Ladybird team and its momentum. Mozilla isn't doing anything with Servo anymore.

But I also don't really see a compelling reason for Ladybird's existence - we already have Chromium, Blink, Gecko, etc. It's hard for me to imagine a world where Ladybird is a healthy contender for marketshare.

The only real novel thing to do in this space is "rewrite it in Rust".