what is "correct" for users' Preferred keyserver ?

[shmick at riseup.net]

i've seen a multitude of ways people input data into this pref

for example, some people put a link to their public key .asc or .txt file

some others put a link to an actual keyserver

from the name of the actual pref, it states a keyserver, so shouldn't
users input a link to their Preferred keyserver and not a link to
download a public key or txt file ?