Thanks for your reply.
For the option #1, I learned, through a brief internet research, that there is a very small but could-be-meaningful difference between firings of 2 power packs since one power pack fires earlier.
There is a flash sync splitter, kind of, with which I can fire 2 power packs using 2 sync cords at the same time...
I'm not sure which one is better, either 2 sync cords or Bron Transmitter. I need to do some tests...
Copper wire or radio signal?
Maybe using only one power pack with a sync cord is a easier way to do it. But sometimes the situation requires more than one power pack.
I heard that with Pocket Wizard, 1/800S shutter speed is not recommended.