The same old comparisons are being listed I see....one doesn't need to be very airline savvy to know what they are.
Of those mentioned in the opening post I could fly QR or EK however despite them having a better overall premium product one would need to be off your rocker to route to the UK via the Middle East from here.
BA is number one for me as they fly direct.....closely followed by IB if I fancied having a piece of tortilla in the Plaza Mayor along the way.