Those are distinct distros, while Bedrock is a layer that sits on top of multiple different distros and actively merges them together. At a glance, vanilla doesnt look like they merge/manage other distros at all? So I’m not sure the comparison makes sense. BlendOS is a completely different approach by using containers to isolate the different systems. Bedrock wants to merge the different systems where ever possible. I wouldn’t say either is better or worse as their goals appear to be entirely different.
Regex is Turing Complete after all.