It probably depends on your TV and DVD player. If your DVD is a progressive scan then you will see a greater benefit from component video. Or if you have a big screen TV you will probably see a bigger difference with component.

If you choose to go with S-video, you may want to consider going direct from the DVD to the TV. Each connection is a degradation in quality, but you do sacrifice a little in convenience.

From here we could get into a discussion about cable quality, but that's an entirely different topic!