No, the only advantage to using the component hookups from the reccy to the TV is that you won't have to assign another "antenna in" on the tube. I have my XBox and 2910 hooked up to the 3805 with component connections (my TV will do 1080i but only thorugh component feed, and the 2910 only does 720p and 1080i through DVI or HDMI-bummer), and my VCR and dish through composite...so I only had to run one set of component cables from the deck to the TV and let the 3805 upconvert.
Bryan...of course, if you've got a spare composite cable use that-how picky are you gonig to be about a programming image, right?...