As a new QF Platinum going AKL-Malawi on a DONE5, Mrs Jrobin and I have a choice of
AKL-DOH on QR 921 (Airbus A350-1000 according to Expertflyer) and ~ 4hrs (10pm-2am) in Al Mourjan? lounge in DOH, then likely to LUN on Boeing 787-8 Dreamliner or
AKL-SYD on QF 140 (Boeing 737), perhaps an hour 8:00-9:00am in the QF International F Lounge, and QF63 SYD-JNB (Boeing 787-9), arriving same day (16 hours earlier than QR) so could have an overnight near JNB at a hotel and start adjusting to time change.

Our only prior experience International business class was JFK-HKG-PER on CX.
Any suggestions?
Thanks