Sounds simple to me. If you want cash, a reasonable profit share (when it happens) then stay in the left seat at EK. Trade this for everything negative that goes with it - this is what I'm being fed from guys who have left EK. Others may have a different opinion.
Jet2 offers a manageable work life balance with a lot of time spent at home in the winter. Rosters aren't fixed pattern but much more family friendly. The flying is generally all 2 sector days with a return to home base. There has been developments with T&Cs, pension contributions, LOL, medical cover etc. Above all a happy ship with the company making and sustaining healthy profit margins year on year.
BTW, a SFO won't see take home pay hitting £4500 pcm unless he/she has several additional roles - ATI, TRI, CRMI etc. All of which are possible to achieve here, at the present moment in time.
All the best, CK