Hmm...DenLiner or TARDIS? />_<\
I'll take the DenLiner, because it has the Taros Imagin that I watch their antics and get free entertainment there. TARDIS is very spacious, but I'll just end up getting lost in there, due to the fact my curiousity gets the better of me on seeing how many rooms does a TARDIS has and never seen to find the exit.
The DeLorean is right out of my opinion, because I fear that the car may fall apart, due to...er, lot of bits missing and I get panicked a lot when the car's going to break apart any second during time travel.