There are multiple tools in this space - even devbox has a direct competitor. With mise, I'm not expecting an isolated environment, but rather a meta package manager. I can install many tools directly into my user shell. If I wanted that with nix, I would be using a nix user install rather than devbox.

You just choose what you like most. And mise seems to have a large fanbase.

Mise just works and takes maybe 1-2 minutes to explain and have a tool running on a team members machine in my experience. I couldn't get into nix, too complicated for me and I've yet to find a resource that makes it click for me. After that I would feel comfortable encouraging the rest of the team to use it but as mise is so easy and even more popular, I will probably just stay using this. I will look into devbox though, thank you for the recommendation!