User blog comment:Green10000/Ultra Greatswords/@comment-4511886-20140610180816

My personal favorites are the standard Greatsword and the Pursuer's Ultra Greatsword.

Also, although I've yet to get them, I think the King's Ultra Greatsword, Smelter Greatsword, Zweihander (Dark Souls II) and Black Knight Ultra Greatsword could be good candidates. Also the Drakewing Ultra Greatsword would probably be quite useful if you're building Dex.