Thanks Mwenenzi, your comments prompted me to add a little more info:
> I am travelling for work where I can usually choose the airline.
> For me lounge access is nice to have, exit row/extra leg room seating too (I am 1m92).
> I noticed that QR seems to give mileage bonuses for family members as well as the individual for those with status, but I was not clear if they have to be travelling on the same flight or can earn these bonuses when travelling independently