Just a quick correction, I belive prior to the update, it was a 16 damage for 18 H/s sacrifice. I used it and compared them extensively.

The reason I switched after using it for so long is because as archers, you take the most damage. You have low armor and defence unless using drainers, so 18 H/s is about half as useful on an archer as it is on a mage or bear. Your offence is your defence, so I would mainly compare the trade-off of damage, crit, dodge, and possibly armor when determining the sets' worths.