Mazda or Opel? Ask for quick help!

Hi, my girlfriend is looking for a new used one. We have a maximum budget of 1500€. Today we were at a dealer. He offered us an Opel Corsa bj2001 75ps with 140,000km. Furthermore he would have a Mazda 323c bj98 with 180.000km. I don’t know about cars. I would have taken the Opel. Because I find 180.000km a bit violent. But the dealer said that the motor of the Mazda would be very good and he would give us even 2 years warranty on the Mazda. Now know As can be seen from the budget, the new used person should continue to be economical in maintenance in the future. What would we be better advised with? Many thanks in advance for quick help.