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I use crit chance reds. I used to use AD reds, but I find the crit chance helps my early clears way more since crits boost his fury much faster in addition to the obvious extra damage. More crits>more heals before you get your lifesteal. I could see crit damage being more useful for late game though I suspect your early game would suffer.
Also, you should Q right before the last hit you have in that camp. That way, you get the maximum benefit of heal + 25 fury going into your next camp.