I dont know how many of you are aware of that but the exotic mission rotator count as 4 points for that quest, if the exotic mission is vex obscura or pressage it better to farm those insted of strickes, it took around 20 minutes for eatch mission compare to an average 10 minutes per stricke. The difficulty doesnt matter can be normal or legend. PS you need to wait till the mission end for vex to count if you leav until the timer apear it will not count