Try both, see which looks the best.
look for colour banding and pixalation in dark areas.
reason...
Some DVD players can default to RGB colourspace over HDMI.
1.Look for options in menu to change to YbYcYr/rgb over HDMI
2.Or try component
For instance my HD-A1 HD-DVD into my 42" Plasma defaults to rgb over HDMI so I use component. My Denon 1920 is fine over HDMI , but I have a Sony NS92v which is much much better over component.. even though it has optioins for colourspace... it simply performs better through component. I use all QED cables btw.
hth