Board Thread:General Discussion v2.0/@comment-26347196-20151109173852/@comment-28562632-20161130054037

Sans, but Omega flowey probably wanted you to suffer, as hinted by his dialoge. He can insta - kill you, as shown near the end of the battle, and his attacks do less and less damage as your health deplets. He is probably harder than sans, but sans has a very good reason for killing you (GENOCIDE). Asriel is just an even stronger version of flowey, so he is better than sans too. But in Frisk/Chara's point of veiw, Sans is a lot harder.