WX MAN
Having done both for nearly 30 years I can help you out...
It's two different airlines. When I changed from shorthaul to longhaul I kept being astonished at the differences and whilst both sections are under pressure to cut costs there is nothing to compare an early start 4 sector Airbus day and an evening report single sector trip to the sun.
It's all about pace and lifestyle - the money is comparable because many spend the extra downroute having a bit of a life. Seniority isn't hugely important on the 747 fleet as most people find the sort of trips they like and many are much of a muchness.
In the end it comes down to family - shorthaul suits many with young families whereas longhaul keeps you away more.
The flightcrew are all super and it made going to work a joy