Obviously, people who have not used both programs are voting.
The audio is much, much better in windvd. Powerdvd has many different fast forward/rewind speeds, and this is the only feature is has that windvd does not have.
If you have powerdvd, turn up the volume and you will hear a strange mechanical sounding distortion.
Windvd=perfect dvd software, except it doesn't have the nice fast forward/rewind features.
PowerDvd=ok dvd software because the audio Sucks.