Forgive me if I repeat some things that I may have said elsewhere, but I will give you my input on the subject matter for those that are interested. I am a TRE at easyJet and have worked there for nearly 15 years. It is, overall, a great place to be. You can argue contracts, countries to live in, perks, management failings etc, etc. If you take it as read that both BA and easyJet are fundamentally safe airlines with healthy balance sheets, then we can move on to the key points that separate them.
Arguments for BA -
1. Opportunities to fly different aircraft types.
2. Mix of long haul/short haul as you wish.
3. Seniority bringing great advantages as the years go by - once lost those advantages can never be recovered.
4. Pay increments every year.
5. Stable rostering, if you want it - easyJet has more roster instability, particularly at the big bases like Gatwick.
6. Great staff travel.
7. Generally well treated by management (although some BA pilots may argue differently!).
Arguments for easyJet.
1. Preferential bidding - ie you ask for earlies/lates and generally speaking get what you ask for (unless you are a training captain!).
2. Fixed-pattern rostering - 5/3/5/4 so you know your off days years in advance.
3. Quick time to command.
4. Good starting salary for captains (£104750 plus allowances, 7% pension contribution, performance bonuses, sector pay, loyalty bonus (incremental pay in all but name).
5. Very few night stops.
6. Opportunity to live and work in numerous bases across Europe.
Of all of these, there is really one stand-out difference that anyone comparing easyJet and BA should consider - night stops. At easyJet you get home most nights and at BA you do not. Arguably that is the biggest single factor in any decision to be in easyJet against BA. I personally love coming home every night to my family and therefore BA has always been a complete non-starter for me. I fully appreciate that is not everyone's position, but it is most definitely mine. If you join BA at, say, 25 years old, you will be there for 40 years. You could conceivably spend 20 of those years not sleeping in your own bed - that simply is not what I want. In the final analysis, I would say that is the key distinctive about whether or not to make the leap. It is a one-way move from BA to easyJet and only a handful of pilots have done it, which tells its own story. BA has so much to offer, but if you want to be home a lot then easyJet has got it. If that is not your main issue, my advice would be to sit back at BA and enjoy the numerous other great advantages of flying for one of the world's top airlines.