If ever asked for advice I'll always say, "pick what will make you want to come back to the gym" if Full/B does it, do that, if Bro/S does it, do that, if curls give you a boner, go back and curl more.
I beileve the part we overlook a lot of the time is enjoyment, doesn't have to be so calulated, "this method is 2% more efficent than the onther, so why you wasting you time?" who gives a fuck, even if your method is 10% less effctive for your time but you like doing it and keeps you comming back, nothing wrong with it, that is your ticket.
So like for like, in a calculated approach FB may be more eeffective, but if it doesn't keep the person coming back for more, than we'd have to agree that in this case it is not the more effective method.
In theory Yes, but the work needs to be done and motivation doesnt come easy, horses for courses, there is no answer this one as there are more elements involved than simply like for like.
Bro split kept me coming back for 20+ years, would I be 5% bigger now had I done FB routine, prolly, but I'm nosing any sleep over it.