I look it as what am I going to use all the time, i.e. Fatebringer/WoC X3 Ice Breaker X3 Hunger of Crota- (no Gally :( ) only have 2 fang Kept 2 VoC Kept 2 Vex X3 Light of Abyss Kept 2 Sword Breaker Kept 2 Corrective Measure Kept 2 Guns that I use all the time I keep one on each toon. I use the app to swap around stuff from time to time and recently went through a huge purge of weapons to free up space but I try and keep a weapon with a different burn in each slot, (FB, WoC, Vex)(Sword Breaker, IB, Found Verdict)(HoC, Truth, and I have a couple vendor Arc Rockets) on each toon so that I have something ready for Nightfalls and any type of shielded enemy I can take the shield out fast then switch to other weapon and destroy them. I have recently started rotating my stock around when doing nightfalls/patrols/ROC strikes now that i've focused on leveling everything up but raids I usually go with what works best for each one.