@uhoreg I didn't have a strong reason, tbh, but I have a couple. Mise handles overall system setup and maintenance, from dotfiles to tools to languages to random scripts you want to run, so it's just generally more versatile than asdf.
And on the mise site, they make the security argument; asdf plugins are third-party, so you're not just trusting asdf, you're trusting whoever wrote and contributed to the plugins.
I will say the learning curve for mise is higher, at least if you want to set up things beyond language and tools. But migrating is easy, since mise reads from .tool-versions files.