The DeLorean is a trout car that does trout things. Even when it travels through time, it does so trouttily. The Back to the Future films are amazing, but that's irrelevant in this regard because the DeLorean is troutty. By having a TARDIS, you're not Doctor Who. You don't have some incredible adventures through space or a vast quantity of stupid "adventures" in space either. You have absolutely no relation to the show, other than having the TARDIS.

This is like asking someone which they prefer: tin cans with bits of string, or a smartphone. Sure, you can have some sentimental value attached to the tin cans, and you could have really enjoyed what was done with them in the film "Tin Cans 2: Revenge of the Baked Beans", but they still can't play Cut the Rope. Smartphones are simply superior is every way - bar containing beans, of course - and to prefer tin cans makes you a wanker. xD