Blu-ray Menu System for Movies

[maui2k8]

Having recently liquidated all of my HD DVD collection and player, I made the switch to Blu-Ray about a month ago (Samsung BD-P1500 - so far so good!).

One thing I was curious about were the differences in the menu systems for the movies that are on both HD DVD and Blu-Ray (Warner Brothers). What I noticed is that on HD DVD, most of the menus seemed to scroll up and down smoothly when you viewed the Title Menu while watching a movie. On Blu-Ray they just seem to pop up and then disappear (in other words not as slick). This is in no way a big deal, but was curious if there was a technical reason that HD DVD had a menu system that scrolled up and then down to display and hide where by Blu-Ray just appears then disappears.

Was this one area that HD DVD had more flexibility in their menu system than Blu-Ray or just that Blu-Ray movies just did not implement their menus systems this way?

Thanks!