Rust/v8 isolates vs rust/javascriptcore

Can anyone shed light on v8-isolates vs javascriptcore for embedding a js engine in a Rust server ?

Bun seems to imply jsc is faster, while Cloudflare seems to be betting on v8-isolates.

I'm looking for one that lets me run lots of mini js green threads and pre-emptively, non-cooperatively interrupt them.

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