The 159 is a better car. Anyone who thinks a 156 TS is better is dreaming. The 2.2 petrol engine in the 159 and Brera is excellent and far superior in performance and refinement than any 1.6, 1.8 or 2.0 TS so I am not sure what the above poster who said the petrols were rubbish, is smoking.
Alfa offered the 159 Q4 saloon with the 2.4 JTDm turbodiesel engine, which offered near-40mpg average economy, but performance was only fair with 0-60mph in 8.3 seconds.
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