I don’t understand why the DVD is packed with Blu-Ray and sold in one box.
If you don’t have Blu-ray player, the Blu-ray is useless to you, because you can’t play it.
And if you do have Blu-ray player, the DVD is useless to you, because why would you want to watch the movie in worse quality?
Some cars have DVD players. AFAIK none have Blu players. So the answer to your question is road trips.