AVS Special Member
Join Date: May 2008
Location: San Francisco - East Bay area
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USUALLY YCbCr 4:2:2 is the best choice... I'd say 90%-95% of the time that's what you want to use.
The exceptions are random models that for some reason, sending them RGB produces better-looking images. So you always want to do a check with your particular display Watch something familiar in YCbCr 4:2:2 then repeat the same scene in RGB mode (16-235 or limited or Standard, different manufacturers use different conventions for naming). If the images look the same, just use 4:2:2 and forget about it. But if RGB looks better, switch all your sources to RGB mode if they have an option to do that.
If you are doing the comparison between the 2 modes and you don't notice either one being obviously better (or worse) than the other mode, don't fret over it. Most of the time there's not going to be a difference. Don't spend more than 10 minutes looking for differences either. If you see a difference, it should be fairly obvious and you won't need anthing close to 10 minutes to decide that one of the connections looks better.
In even more-rare cases, RGB looks worse than YCbCr... doesn't happen very often, but I have seen it 2 times on 2 different brands of displays more than a couple of years apart.
You never want to assume 1 mode is the right mode all the time. You really have to check each brand/model display you use and if you ever change displays, you should check again with the new display. I've never detected a way to determine what mode is going to work best, it has always come down to a visual check. Fairly close to 95% of the time, you'll see no difference between RGB and YCbCr 4:2:2 mode so don't be surprised if that's what you experience.
"Movies is magic..." Van Dyke Parks
THX Certified Professional Video Calibration
Widescreen Review -- Home Theater & Sound