ORT (FGO) vs Barragan (BBS)
Cuz no one, even in that game comes close to moon busting. Not to mention taking CG animated cutscenes as legit feats is dubious because it's not uncommon for those animations to exaggerate an attack beyond what that person can really dish out. Example, Sephiroth's supernova nuking the Solar...forums.spacebattles.com
"cutscenes are exaggerations bro just trust me"
"Sephiroth's Supernova isn't legit"
Also, what galaxy level attack animations are there in FGO anyway (not that ORT needs that at all)?
It's not an animation, Chaldea looks inside one of the Tree's and sees an actual Galaxy (and Da Vinci has a mild existential crisis over it)
Also Kama and Kiara in particular are shown creating cosmic spaces, both of which are called universes multiple times (with Kama's being "I recreated the universe and then replaced all the matter with myself. By the way say goodbye to physics")
And Goetia's Temple being a separate bubble of reality that is the universe as a cell is to a body, which would be roughly galaxy sized.