The response rate for this poll was very low so I will assume that the subject is not particularly interesting to all but a precious few. To my surprise, 66% of you prefer to make your cookies with shortening.
This brings me to a follow-up question: Do you prefer shortening because it is by definition room temperature and easier to work with? Do you tend to disregard butter for health reasons? Do you find shortening requires less of an arm workout?
In general, cookies made with shortening tend to be crisper, cookies made with butter tend to be softer and spread more, and cookies made with butter tend to brown easier. (http://www.preparedpantry.com/butter-oil-or-shortening.htm)
From a health standpoint, it would be much safer to use prune purée or apple sauce. (http://www.mayoclinic.com/health/healthy-recipes/NU00585) Though I have not tried these substitutions as yet so cannot recommend one over the other. Since I am also aiming to lose weight, it would be wiser to not spend as much time focusing on cookies so definitely, healthy substitutions would be a smart direction.