as for the audi being better in many ways.
the alloys are not good at all (although they may look well finished to the eye), they powder coat the base/primer coat, so you will get big chunks of powder coat lift once they chip and water gets underneath lifting the powder coat, as such the best way to refurb them is a chem strip and paint.
The 2.0t is a nice enough unit, and very tunable.
But, would you buy a diesel audi from a company that decided to bolt its diesel injectors from just one side (like merc's did once) so they wear out at around 70k costing 1500quid for a set of injectors? An engine (2.0tdi) which is still quite agricultural, unrefined with a spiky torque delivery and a turbo that's too small? - No
The sensible cash would be on either the BMW diesel - which as an all round car is very good with great residuals, or for a real peach of an engine, the jag 3.0d motor which likely features also in the quirky c6 and not so pretty c5 to name a few.
Would I buy another alfa?
Not whislt they are using the crappy gearboxes from vauxhall which seem to be made of little more than paper mache and tin foil and not until they produce a decent up to date (all alloy) diesel that is a true contender to the bmw (nearly said german but don't want to include vag!) diesel that does not weigh more than the houses of parliament.