Not sure about the theory that MH hardware and software is on a par with BA (can’t comment on KLM). I’d probably give it a go once and see, you might like the difference
QF via SIN would be an A380, currently there is around an 80% chance of an unrefurbished plane which suffers *issues* if I may put it mildly. The refurbished birds are obviously a significant improvement but not sure I’d want to go out of my way for them