More pop corn Don?
The common link between the responses so far is they all use words like "if" or "when" in other words no one has a clue what will happen tomorrow. Witnessed by the reversal of transfers AB to 777, when was that announced, two months ago? So how can you give advice, really, unless it's based on a tray table. I would suggest joining on the fleet that gives you the best life style today, as that will make settling in a slightly more pleasant experience. After that, deal with the negatives as all fleets will have them so they will be the same. I have no idea which fleet has the best life style for you, I don't know which has the best for anyone. Who cares......they pay the same. Just be happy you got the gig and expect changes on a regular basis and the rest won't matter.