User blog comment:Valeth/The Not-So-Helpful FGO's SSR Guide (JP)/@comment-28137023-20180928155108/@comment-27971189-20180929091057

Under normal circumstances, I would say Waver.

However, if I could pick one of them for free because of "Free SSR Campaign" (or things like that) when starting the game as fresh, new player, I would chose King Hassan.

Hope that answer your question.