|March of the Penguins||=|
Region 1 gets a few extras over Region 4. Along with the Happy Feet trailer before the menu, Region 1 also gets trailers for The Polar Express, Duma and National Geographic Animal Special and a Merrie Melodies cartoon 8 Ball Bunny. Region 1 also gets French and Spanish subtitles.
Region 4 misses out on these extras and sub-titles, but get English for the hearing impaired subtitles.
I don't see the additional Region 1 extras as compelling, so I'd call it a draw.