have to disagree with you there. I would argue that the A3 has a shocking ride quality compared to the mk5. Not only that but for its age the MK5 has a relatively nice interior...
where as the A3 has... well the same regurgitated interior every audi has. In fact it even has some of the cheaper bits and bobs from its better looking cousin.... yes the MK5!!
The MK5 interior is worse than the MK4 interior in terms of quality. The A3 interior is a much nicer place to be
Equally IMO the A3 is the better looking car; it has body coloured bumpers for starters, most come with 18's and half leather interior depending on the trim leve. The ride quality is excellent and no worse than a MK5. It shouldn't be either seeing as its built on the same floor pan and shares the majority of its components with the MK5
Given the choice between the two, for me it was the easiest decision I've ever made