Q: If the Holy Grail War were set in Europe, would Cu chulainn (Lancer), King Arthur (Saber), and Heracles (Berserker) be roughly equal in power?

A: ...Well, if we’re talking western Europe in general I’d say the first two would be powered up to an equal degree... though England and Ireland, the odds would be sharply in the respective hero’s favor. Heracles would display excellent power in all of western Europe.

Fate/complete material III, FAQ, pg. 132