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I would reckon in J the 787 would probably be a better prospect than the 380...
...but the big one for mine is the far better reliability of the 787 fleet right now. QF has what five 380's currently running around, and as I type a bunch of services are chronically delayed due to ongoing issues (-OQK coming out of maintenance at LAX seemed to be a bit of a fail and will take time to catch up on a 17ish hour delay out of LAX, for example)...
I'd feel more confident being booked on a 787 service to/from LAX due to more shells in the system and better reliability (in general) vs the 380 which... are iffy tbh (and I've got 380's to/from LAX in a few weeks so I promise I'm watching this space with some really personal investment in the situation ! )