Satiate the need!
Slip them into different sleeves!
Buy both and feel deceived! If you like a film, chances are you might get the DVD. If you love a film, you may end up getting the Blu-ray, the special collectors edition, the directors cut, the collectible bust and even the ultimate-limited-exclusive-super-duper-briefcase packaging that requires batteries for all the lights and sound effects. Paramount has announced the release of a Special Collector's Edition DVD boxset (not related whatsoever to the Limited Release Special Extended Collector's Edition Star Wars DVD boxset) of Star Trek: Enterprise Season 4.