I think the ATI player has the edge over WinDVD due to its gamma setting adjustment. You can calibrate the gamma setting in the ATI player thus the ATI player (if being calibrated correctly) will result in better shadow details. One test can be done using Gladiator at the first batle scene (Roman vs the Germanian), the ATI supposedly have better overall PQ.
ATI Player also has 0 IRE configuration file that being discussed here many times, to help in calibrating the display device.
I have used both, and for my display (XBR400) there's not much difference. I think the PQ differences mostly show up at higher resolutions, ie. with projectors. The ATI player supposedly takes better advantage of the Radeon's hardware capabilities, which helps it scale better.
As for the audio quality, keep in mind that the ATI dvd v4.1 doesn't do DTS. I don't worry about sound quality issues since I use digital out to my receiver.
BTW, I'm currently using WinDVD 2.6 for pretty much all of my viewing. It's definitely easier to use. IIRC, this version allows gamma adjustments via the 'color2' slider (it's been a while since I tweaked the setup).
I noticed somehing about ATI's player last night- No keypad! I tried to get to the deleted scenes on Star Wars, only to realise there wasn't a keypad. PowerDVD I seem to recall has one. Don't know about WinDVD. Have I just missed the thing, or is there no way of entering numbers etc. in ATI's player?
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