Just for fun, I made a list of all 70 of FFXIV's current four-man dungeons, roughed out a seed list using some community feedback, and created a tournament bracket for them all at:

https://challonge.com/tti67wm6

Every few days I'm going to post a public poll to let people vote on the various head-to-head matchups until we have a champion dungeon! The first poll is up at:

https://forms.gle/CdfUePnDKBAc6za99

Note that I've used the real names of the Shadowbringers dungeons, so that's mildly spoilery -- if you're very spoiler-sensitive you might want to avoid participating.