They are two significantly different resorts. SSR has a quiet feel, with beautiful views of DTD, the water, and golf courses. It is close to DTD - close enough to walk. Or you can take the boat or bus or even drive. If you take Community Drive, it is close to Epcot. If you take the road past Fort Wilderness, it is close to the Magic Kingdom.
The rooms at SSR are new and in wonderful condition. They all have balconies or patio. Are you booking a studio? If so, you will have a fridge, microwave, coffee maker and small kitchen. (more with a one or two bedroom) You won't have the same ammenities at the Contemporary.
The 'feel' of the resorts is very different. If you are looking for quiet walks or a relaxing pace, SSR is the place to consider. If you are looking for a louder, more busy feel, then you may consider the Contemporary. (be aware that there is significant construction both inside and next to that hotel which will continue well into 2008 and beyond)
Artist's Pallette at SSR has a more extensive menu than the temporary counter service location at the Contemporary. Turf Club has indoor as well as outdoor seating, and a varied menu.
But frankly to me, the Contemporary is like any Hilton or Hyatt or Sheraton in any city except that it happens to be next to the Magic Kingdom; SSR is definitely a more unique property.