I'd go with tablet now that Netflix allows you to download movies for up to a month in order to avoid streaming annoyances that come from buffering.
Movies aren't ok 24/7 but we once got stuck on a trip from Cape Cod that should have been 5 hrs for 13 hours- watching movies that were new we're a lifesaver.
another thing great with tablet is Chad can probably play video games when he or she gets a little bit older