Thank you very much for this great and detailed answer ! Very helpful. I think I will go with playing the two whites factions while my human opponent will be playing the reds.
Just one point is unclear.
It is very fine to play with one Red player and one White player playing both White factions. If this is your choice, I recommend shared hosting the Reds host a turn and then the Whites host a turn. Shared hosting is more fair and more interesting.
Why do you recommend it ? and why it's more fair and more interesting ?
Isn't it more complex in terms of logistic, you know with the inevitable question "can't remember, who should host this turn, you or me ?"