In the old days I used to just hand everything over to the B scenario because it seemed appropriate redistribute the wealth to the longer, tougher scenario.
Nowadays it doesn't really matter because I usually just play using the "Two Weapon" rule
Claire: Handgun + Bowgun
Leon: Handgun + Magnum
Guns and ammo are not really a scarcity issue in Resident Evil, you can usually make do with preference.