gallileo

If you have HDTV and are looking for best performance, it is recommended that you use HDMI because it is 100 digital from end to end.
The difference in quality will be obvious as you view more 1080P content.

However, running HDMI could be a problem if your HDTV is first generation ( probaly only has 1 HDMI input) or if you are installing multiple HDTV.

For cases where you have a first generation HDTV which only has 1 HDMI input and you have multiple HDMI sources to connect:

Use a HDMI switch. This will allowyou to switch between multiple HDMI or DVI sources to 1 HDTV.

If you have or plan on installing multple HDTV:
Use a HDMI splitter, it has 1 input and 2 HDMI outputs that lets you mirror both pictures on both displays. You don't need to do any switching, it will just show up on both displays.