I have both formats and agree 100% with Claude. I am buying a movie for entertainment not for format. Yes BR loads faster than HD but that does not enter my (little) mind, I just look for a movie that interests me.
I agree with you to a point. I have a feeling that most people have a preference in their choosing. If the movie that you were looking for was offered on both formats would you buy one over the other.
I always thought that I would until I found myself buying Oceans on Blu-Ray and the Harry Potter's on HD-DVD even though they were offered on both formats. Don't have one idea why I did not buy them on the same format.