Help: I don’t know if I should buy a diesel or a petrol truck?

Hi Forum, my wife and I have decided to get a 156 sports car. It should become a used car, but not too old, best after the last facelift. But I fluctuate daily between the decision whether to become a diesel or a gasoline car. We drive about 20-25Tkm a year. So maybe the diesel could already count on it. However, it is of course a few Euros more expensive in the purchase. Besides, I don’t know what the legal situation in terms of particle filtration is. I’m an absulute newcomer to Alfa. I’ve had a touring of 3 cars so far, but the design just did it to my wife and me. That’s why I’m asking you for your advice. Which engine would you recommend? Diesel or petrol? And which one in particular? We’d like to drive the car for a few years. So it would be good if it’s reliable and durable. A steam hammer doesn’t necessarily have to do it. be. Rather a compromise of economy and longevity. Thank you!