This UK Anniversary Box is the better i believe. This Season has more extra features as well as better packaging. The US red box is not divided into season, but into 6 different sections with a different character on the front. Look on the images at amazon.com to see this packaging more clearly.
thank you. what's with the content. the US box says that there ist 19 hours of extras and some booklets. to be honest I really don't care about the specials as long as I get all episodes uncut. but I also heard from someone that the US Box has a better screen source.
anyway, I think the US box is far to expensive and I already bought the UK Box. :-)