Instant DVD vs. DVD shrinks

Instant DVD vs. DVD shrinks

I just try to make a copy from a dvd9 to a dvd4.7 with Instant DVD using the high quality setting and it work much better than DVD shrink, I notes none noise into the movie (cowboy bebop) and I just wander if anyone has try the Instant DVD and make some comparing with another software like DVD shrink or clone DVD or Nero?
Is Instant DVD by far the best program to make copies of DVD (encoding) or is just me and is not a big difference?
What do you think guys?
Thank for your time