In an all-out war? Interesting. I'm not sure what action I would take.
You see, my first instinct would be to stay close to my parents and protect them from harm. I could not bear it if my folks became Controllers, and I would defend them at any cost. Death would be no object in comparison to the freedom of someone like my father. For miserable and sad reasons, they would murder my mother. She is, as it were, useless as a Yeerk host.
I am by far the most viable host body in my family.
But if for some reason I were alone, I would surrender and become a voluntary Controller for intensely personal, ironically selfish reasons. Partially because I always pick what I believe to be the winning side and partially because I am not afraid of either enslavement or dependency. The Yeerk in question would gain a shockingly passive and very peculiar host out of the bargain. I'm worried less about losing my freedom and more about the Yeerk's reaction. XD
So really it would depend on my assessment of who was winning and who I was with.