[sprash]

Always use musl for static linking. As a bonus you might get an even smaller binary than a dynamically linked glibc binary.

[cesarb]

Keep in mind, however, that AFAIK musl won't respect /etc/nsswitch.conf, so if for instance the machine is configured to lookup users on ldap, a musl static linked program won't be able to correctly lookup users.

[beatgammit]

There are certainly cases where you need the features of glibc over musl, but those are pretty rare IMO, and you can always implement a missing piece yourself if using musl saves you enough in maintenance overhead.