Ladybird seems to have more momentum and be further along in development in my testing of visiting random websites. This may or may not have something to do with developer velocity of each language, genuinely I don't know but I think it's worth considering.

Regardless, from what I've gathered, Ladybird is going to ship of theseus their way into memory safety. It's not announced what the C++ replacement language will be, but they are working towards that.