Per their own docs, Bun is not fully node compatible [0]. In my experience, even for APIs its docs claim full-compatibility has some sharp edges. That said, Bun's node-compat story is better than Deno's.

While Node's performance story keeps improving release over release [1].

[0] https://archive.is/NCzRQ

[1] https://twitter.com/lemire/status/1699459534190698999