barrows guide on a rsps? also 73-88% is best to roll for runes (best for ironmen) and anything over 88% is more rolls for bolt racks and less runes which isn't ideal as nobody uses bolt racks for anything. Also if you want specific items like on a iron, you can kill only the bosses that you want to avoid duplicate drops.
it's probably not advisable to only kill the barrows brother that you want the respective gear for because every brother that isn't killed drastically decreases your overall chance of receiving any item, including those from the one that you killed. Assuming the mechanics on Zaros work according to OSRS
In other words, if you're looking to get a guthan's spear, with respect to time efficiency you are better off killing every brother rather than just guthan
Practical Barrows Guide (Minimal Resources + Advanced tips)
in Mini-game Guides
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it's probably not advisable to only kill the barrows brother that you want the respective gear for because every brother that isn't killed drastically decreases your overall chance of receiving any item, including those from the one that you killed. Assuming the mechanics on Zaros work according to OSRS
In other words, if you're looking to get a guthan's spear, with respect to time efficiency you are better off killing every brother rather than just guthan