I never flown other 5* airlines besides SQ,CX,GA and MH even though they're removed from the 5* list. In my opinion Skytrax is quite trustworthy in some aspects and can't be considered total joke. From my own experiences and from trip reports of other 5* airlines, only Hainan airlines really far from that category. I never flown BR but from trip reports they are consistently good. But I'm sure SQ is the best from my own experience and from trip reports in all classes. It's just my opinion.