In your this particular case, I would look at which dealer could offer better support and keep the machines up and running. Both are good quality machines, but even good machines break down from time to time.
For a while, the Liebherrs were compared to BMW's in terms of smoothness and operator comfort, they had some minor electrical bugs that required intimate knowledge of the machines to troubleshoot efficiently. I don't know if that is still the case with their machines today. The scrap yard in my town runs Liebherr machines and they seem to make a profit.