Lookin at the 3150 champs. I currently play Darius alot. Master Yi and Ashe are my other two favorites atm. I'm debating on getting Olaf or Pantheon, I haven't played either so Its a pain deciding. Any insight would be grateful

pantheon is difficult to use for the beggining... so i think olaf is a better choice

Olaf
I'm only level 10 but I just love him.

Pantheon is good if you like to be aggressive because of his passive but like Agustínyquepasa he is fairly difficult to use in the beginning and his ulti takes some above average timing, planning and communication to use well. Never played Olaf so I can't say anything about him but I use Pantheon more than I use anyone else.