Decision-making aid Diesel – Compacter

Moin, I have to buy a car, because next year I will travel an estimated 18,000-20,000 kilometers. The choice is for a diesel, as I will pull off at least 60% of the track on the BAB. Now I have looked around the used market at the compacts and found 3 interesting cars. All diesels, all Euro6, all run about 50,000km and with good, very similar equipment. Prices in the range between 12 and 13 thousand€. More precisely… Golf VII 1.6TDI (EZ 11/15, 5-speed) Leo n III 1.6TDI (EZ 06/16, 5-speed) Renault Megane 130dci (07/17, 6-speed) The Renault is standing at the dealer’s place around the corner with me, where we used to be with a car a while ago. It was all great. For the others I would have to drive a good track. IdR is very thin in the corner. Which is the best guess? For the Megane speaks in any case the modern optics and longer maintenance intervals. The other two are probably simply the a car. What do you think? Who experiences, especially with the Renault? Thanks and greetings!