Looking for the best 2-HanderFollow

I've found two swords I would love to get a hold of: the Flamberge of Stability and the Razor-edged Claymore. They are both attunable (so am assuming a quest item) and have a minimum score of 50 in greatsword. If anyone has even the slightest clue about either of these two swords, please post here.

As a second note: anyone have any other great ideas for a 2hander?

Thanks