I think the choice should be made on how u drive,i have owned 16v and 8v (own 8v at the mo) and from my experience you have to rev the 16v more to get the best out of it whereas the 8vs torque band comes into play earlier than the 16v.Obviously the higher you get in the rev range then the 16v comes into its own but it also is going to weigh slightly more not a lot but a little,i think the best thing you can do is try a test drive in both and see how you feel.Also take into account running costs maintanence costs and even engine repair bills and ease of reparing the engine if anything went wrong.