The Amex one is $550 - $200 for Uber - $200 in airline incidentals which often includes more than you think, check FlyerTalk. Net fee is the same if you do the legwork on Amex.
at one point you could buy delta gift cards and have it covered under the $200 airline incidental fee. Neeting you 200 off a flight of your choice for `free`.
Delta was always hard because they didn't sell gift cards online -- only at the airport! As far as I know that still works, but as always with this stuff, check the thread on FlyerTalk. United and American sell gift cards online ^_^