One is better than the other.

Moderators have access to one or several servers, and their handled appeals require evidence to be presented.
Administrators have full access on all servers and their handled appeals do not require evidence, with the exception of cheating appeals.
Administrators are also able to hand out punishments on the forums and discord servers too.

How can i be the moderator and admin?

Go apply https://blackwonder.tf/form/moderator-application.8/select
Goodluck!

Thank you.

Your question looks answered to me. If you need some more help, Feel free to make another question.