I would have to say that Magic dart is MUCH more useful. I have 89 magic, and when i was last at drags (88 magic) it took me 40-50 chaos per drag. Now, at 89 magic, ive killed 3 iron drags and 1 steel with 98 deaths. Frankly, i think thats more worth it. Lets say at 40 chaos per drag, that would be 4*40 = 160 chaos 160*130=20,800 for 4 drags with chaos 98*270=26,460 per 4 drags with deaths Not bad considering its 2x as fast and other rune costs. More xp also, and that matters also :)