Apart from BA at LHR (EF or WW), you will be hard pushed to find a better paying airline in the UK when you consider the working patterns of QFUK compared to many other airlines. My advice would be to come to the UK interview. At the very least, it will be interview experience and you could make a holiday out of it. If you get it, that would be a bonus.
Have a look on this forum to see what QFUK crew are saying. Then have a look in the D&G section and see what the QCCA crew are saying. The feedback from both bases should give you something to base your personal decision on.