I find it difficult to compare offshore to FW commercial in terms of quality of life. Granted, IF you reach the hallowed levels of TRE, then you are earning £100k+ but the alternative in the FW world is far rosier:
FW:
Better and more benign flight conditions.
£100k is not that hard to find in the commercial FW world.
NO freaking goon suit...(This alone would tip me in to the FW world).
Options to fly to different parts of the world and often.
What is attractive about Offshore (IF you could go FW).?
Now if you could fly big helo's outside of the offshore world, that would be a more difficult decision to make.....