I've only flown BR, but hear that the service on OZ is quite good. IMO, Y and Y+ on BR are both quite good, service is good too. BR Y with 33" pitch and 3-3-3 on the 777 is quite tolerable IMO. Of course their Y+ is great, I'd go for that if possible. Generally BR IMO is very reliable, they have had an excellent safety record, and I like the flight times they offer.