I’ve been using Deno too. Although npm support has improved and it’s fine for me, I think Deno has more of a “rewrite the world” philosophy. For example, they created their own package registry [1] and their own web framework [2]. Bun seems much more focused on preexisting JavaScript projects.
It's interesting that people have directly opposite opinions on whether Deno or Bun are meant to be used with the existing ecosystem - https://news.ycombinator.com/item?id=46125049
I don’t think these are mutually exclusive takes. Bun is essentially taking Node and giving it a standard library and standard tooling. But you can still use regular node packages if you want. Whereas Deno def leaned into the clean break for a while
[1] https://jsr.io/ [2] https://fresh.deno.dev/