It's rather an "end-result" than a "brutto salary" thing.
LG employees are going to have a salary freeze for the next 3 years, allowances are higher at CV than at LG and CV employees got for the last few years a real nice profit-share bonus where at LG the bonus has been mediocre to almost non-existing.
Another point which will determine your real, net salary in the long run is the perspective of becoming a captain. With the present situation my upgrade to captain will take at least twice as long as it would be the case if I join CV right now.
Of course you'll also have to consider the future of LG. What will have happened to LG in 10 years? "Swissair to Swiss" phenomenon anyone?