Swan and Dolphin have the best because of them having the Westin Heavenly Bed.
And I don't say that because of working there. I first stayed at the Westin Peachtree Plaza in Atlanta and enjoyed the bed so much that I said when I go work for hotels, I want to work for Westin. THAT is the reason I work for the Swan and Dolphin.
And with a price tag of almost $5,000 for a bed, it better be the best bed out there. (It's also won many, many awards each year for being the best bed in the world.)