Well I've tested them both and both have good qualities about them

Both cars where the same age and had the same cabin specs, both in great condition...shows how with a little care they stand the test of time (both p reg). The 8v was such a smooth engine, at home on the B-roads as well as through town. It had a nice delivery of power and would definately suffice as my next car

....BUT...I'm after something that can give me more of a grin factor in the performance department...so this is where the 16v was the winner.
I drive a 1.6sr New Beetle where the gears are set so that you must use them to get a grin, so this fact helped me with the 16v. I've heard a lot about the 8v being better on low down torque, but really couldn't see this as such a factor. On the B-roads the 16v did have me grinning more. Both cars had upgraded suspension, Milltec 'zorsts and performance filters. On a motrway at 70mph the 8v was reading 41.8mpg and the 16v 38.5, so the difference here wasn't too bad....around town the 8v read 34.7kpg and the 16v 32.4...so again not too much difference.
I'm going to see an AMD fettled car tonight...16v, and will see how this does as is supposed to offer better mpg as long as the happy foot doesn't go too wild.
So it looks like a 16v for me...but the 8v is also a lovely car
