What are the differences between a gasoline car and a diesel car?

I will probably have to change my car. I can't afford a new one at the moment, so I'm looking for something within 10 years old. Some models have either a petrol or a diesel engine. So the body is the same, but the "heart" runs on a different fuel. And I'm wondering what are the practical differences between these engines? Maybe some consume less fuel or run more quietly? Maybe they are less prone to malfunctions or the same displacement gives different power?
I will probably have to change my car. I can't afford a new one at the moment, so I'm looking for something within 10 years old. Some models have either a petrol or a diesel engine. So the body is the same, but the "heart" runs on a different fuel. And I'm wondering what are the practical differences between these engines? Maybe some consume less fuel or run more quietly? Maybe they are less prone to malfunctions or the same displacement gives different power?
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