What is the most durable/robust macbook to buy for < 3200 euro?

3200 euro = 3640 usd

The 15" MacBook Pro from 2015 because the keyboard won't ever stop working.

you tested this yourself?

Yes, I've had a 2014 for almost 5 years now and the only thing that it needed was a battery replacement earlier this year.

These MacBooks last for a long time for some reason.