BA
Having joined BA last year:
Roster stability is good.
Bidline, although complicated allows me to bid quite successfully for a months work. I have been able to get to to most of the places I want to fly to. Have most of the days off that I want. Get some weekends off. Get a long run of non leave days off. Although not all at the same time.
The bidding system gives you the flexibility to manage commuting from almost anywhere.
777 is a top aircraft.
Destinations are good, all 35 ish of them, I like India, the Caribbean and China. But there are also some good trips to be had to the US, Africa and the Middle East. And we are getting Calgary and Singapore/Sydney.
There is a path to shorthall and other fleets.
Staff travel is good, when it works.
On the downside:
Time to captaincy is long on longhaul.
The pension is inadequate.
You are contracturally obliged to accept un rostered work, if 'they' can find you. Apparantly happens more than it rarely did previously. Never has happened to me or the majority of people I know.
Overall, a better deal than I was on a year ago and the bidding system is a major part of this.