Its a question of lifestyles really, if you still really enjoy flying then if you go to the airlines you'll miss the type of aviation you're committing now. Its quite limiting to see the same pitch attitudes never change and never exceed thirty degrees AOB. However, if you feel you've done enough of that and just want a permanent stable career till you're sixty I'd say airlines. Excellent pay and conditions etc. with the majors. I hear Southwest is excellent but a bit of a closed shop. Hope some of this helps!