Hmm, I'd say stock the Alfa sounds better engine wise. But my 2002 has a sebring center exhaust that sounds very fruity... The killer in the alfa for me is "can you fit in one", at least more than 15 minutes... I'm 6ft tall and normally proportioned, I had to remove the stock gas pedal and make something up to attach over the pedal rod so I could unfold my right leg... Then I moved the seat back, I rigged spacers for the angle (too laid back, like a lounger sofa)... And still I felt like a gorilla, you need long arms and short legs.
The exact same driver experience, minus the beauty inside and out, could be had with my bimmer so I kept that, and my sciatica went away... Bigger trunk too, but we're not talking practicality now, are we ?
But if you have none, it's hard to resist the lure of the Alfa, it's a lovely car. They are a solid 10-15K over a similar condition bimmer though.