I prefer DVD's give a much sharper picture. I have an ITVV B747-200 Virgin Atlantic video on DVD, and its great. Also a Concorde video from ITVV equally as good, but you can't skip to certain bits at a click you have to search.
A340 LoVeR! EC-GQK - LHR The Bussiest International Airport & 3rd Bussiest In The World!
The ariport series sold at justplanes are great. Too bad they don't sell videos anymore, but I bought the DVD's and they are ok! I might also recommend the world air routes series... I have Air Tahiti, Polynesian and AirCalin, and they are all excellent.