My main objection to the debate was that nobody pointed out that the phone booth is basically a rip off of the TARDIS.
We need to ask ourselves; why is it a phone booth in Bill and Ted? It makes zero impact on the story it being a phone booth. It could easily have just been a box all sci-fied up.
For Doctor Who, however, it is a police box (an old british phone booth for emergency calls) because that was what people would look for it when they needed help and sure enough they would find it inside. It is a pre-ghostbusters "who you gonna call?" In the modern series it takes on a whole new level where it still works and it does its part and from a seemingly lowly, dated bit of technology becoming the most spectacular hero in the end. Replace "bit of technology" in that sentence with "country" and I think most Brits will agree that that epitomises our view of ourselves.
That said, the Delorean is miles better than both. It's just WAY cooler. It brought gull-wing doors to the masses.