Which 50s scooter is reliable Piaggio,Gilera Kymco

Hello Now that some of the cheapest models of the respective manufacturers have rather discouraged me, I now have 5 other scooters in mind. They all cost between 1500 and 1700 € and there I expect and hope for a great reliability, so that the things run without problems from service to service without problems. And if nevertheless 1 lack occurs that you get a guarantee on it without any problems. Specifically it is about the models: Piaggio Fly 50 4T Gilera Storm 5 0 2T (allegedly the same as the Piaggio TPH) Kymco Super 8 Kymco Agility City Kymco Vitality 50 (Sportstream) So since I actually have a low consumption, I would have to remove the Storm 50 from the list at the same time or? Supposedly it needs a lot more than the specified 3.5l… With the others I wonder, how reliable are they. Did Kymco really overtake Piaggio in terms of quality? And are these models a lot better than, for example, d ie Kymco Agility ONE? Would be really nice if you could tell me your experiences or the experiences you have heard. Because after 1800km in 4 years with a China scooter I would like to go for sure. Thank you