BMW 535d vs Audi A8 4.0 tdi

[blitzed007]

Right guys im after some advice please

I plan to purchase one of these two diesel beasts in 6 months time and would like some input on anyone who has owned either one of these two. I toyed with the idea of a 730d but im not too sure about the looks and the reported reliability issues on various forum sites so its down to the above two.

Which out of the two is the most reliable?

Which year / years is best to be avoided?

Ventilated and massage seats is this option available on both these motors?

Is the BMW 730d really that bad reliability wise?

thanks

[blitzed007]

Im looking to spend around 13-14k

[blitzed007]

Right after extensive research and opinions from above im going to opt for the Beemer, cheers guys