For more than a dozen years I've been travelling business class on a variety of carriers long-haul between UK and the Carribbean/Latin America, either direct or via the US - I've tried 'em all, doing about 10 or 12 round trips a year. My criteria for selection is:
1. Reliability of service and connections.
2. Decent Carry-On Baggage allowance.
3. Type of Aircraft / Seat.
4. Cabin Service.
5. Frequent Flyer Programme.
I travel BA more than all the rest put together - stunning reliability in spacious, comfortable cabins with professional service from people who put up with far more tantrums from some passengers than I'd ever put up with.
Well done BA - does exactly what it sez on the tin...