Welcome to the board Rob.
Personally I'd go for the TTC. Reasons being:
1, I prefer the styling, smaller and more sporty.
2, I prefer the interior, again more sporty/fashionable and with a 'cocooning' feel to it.
3, I've got no kids (yet) so I'm not ***** about rear seat space and a massive boot (the TTC is reasonably practical anyway).
4, The 225 TTC can be easily chipped to 270ish BHP for less then £900, this is probably my main reason for choosing the car over the A4.
5, The TTC would probably handle better and be more 'chuckable' due to it's smaller size.
6, The 1.8T engine in the TT can be fairly economical if you drive it right (30mpg+), the 3.0 would be more thirsty I'm sure.
Oh to have the choice. /ubbthreads/images/graemlins/cry.gif /ubbthreads/images/graemlins/wink.gif
Cheers,
Christian