I have had both, My 04 3500 has the premium cloth, My 04 2500 Hemi had the standard. The premium cloth is definitly more durable and the front seats have better lumbar support. You will use the folding flat storage more than you think... Also the premium cloth seat has a better center console, change holder and power outlet, along with the under center seat storage.
As far as the rear goes, it has a split bench as opposed to the full bench on the standard.