You get a better/larger room (suite) in the FS for the same money. Have stayed once at the Adlon and 3 times at the FS. Adlon has the nicer location on the Brandenburg Gate, FS has the nicer interior design and you get an Executive Suite for a reasonable price. And one more reason to choose the FS: It may close or the property may get another hotel company as a tenant since FS is making huge losses here.