C30 D3 or D4 – which is more recommended?

Moin colleagues, looking (actually I’m constantly looking for one) for a C30 with 5-cylinder diesel as a potential replacement/complement for my 2001 Saab 9-3 convertible and as a replacement for my faded 89er 480 turbo (which is a g… erm insolently great automobile ) the question arises with the used-year-old car offers about the engine choice. Sure, there are not many in this area, D4 even less than D3. A D2 would be enough in view of the driving performance, but – hey – I also want fun. Analogous to this question here my question, which diesel represents the more recommendable variant? Which one is suitable for the car? Does the performance of the D4 come well on the road? In my eye there is an offer in Bremerhaven, a D4 R design, 2 years old. Pricewise like similar D3, but one year younger. Of the annual driving performance the diesel would not be in question. And as a gasolineer probably only the T5. If you get it’s opinions. Thank you Robo!