Originally Posted by
rkkwan
With 2 or more people, I agree, a private car is definitely worth considering.
I tend to agree. catharsis, with bags (as you indicated) and not having done the HKG/SZX border crossings, it might not be a good first to do. If you're adventurous and can keep an open mind (i.e. calling the carnyness of the border crossing a cultural experience), then go for it and do the transport.
If you dislike headaches, then I say private car or go for the flight option. But your flight questions are valid, so as jiejie suggest look into mitigating those risks/concerns.