Newbie questions

Hello. Come from the E36 forum and have a clue about SMART zero. That’s why I would have asked a few Newbie questions about the topic: “Procurement of a used Smart”. So, I’ve already read a little bit here in the SMART forum. I came across that the small engines probably didn’t convince by long mileage. Furthermore, you could read that there was probably a “Facelift” model from any year of construction. So what should you pay attention to when buying a “ForTwo”? Diesel or gasoline? Automatic od How high should the max KM number be? When was the “Facelift” built and is it adviceable to buy it? Would be nice if I could get some helpful tips.