When I was 737 F/O in the 80's, it took us 8 years to get long haul position on 742 or DC10 F/O. OTOH, it took 5 - 6 years to get long haul DC10 F/O at Condor. Some would rather to fly to sunny destinations sooner rather than flying around Europe in miserable weather.
In those days, the 742 F/O position took us away from home a lot and we had very little time at home. SOme of the cargo flights went around the world and it took about 8 -10 days before I got home. So, it's really a life style issue.
I have a old classmate and we took different route in life. He flew for the air force. When he left the airforce, LH was not hiring and he was hired by LTU.
LH is a good company and provide good job security.