Interesing reading, until very recently Gems was my go to but lately I have found myself using OCD more often. I don't really know why that has come about but I was finding a lot of post on Gems in Spanish and being a non speaker this could be why. I will have to try using both more and see which give the best results. For me its not all about the payouts nice as they are but I find I get a bit more interaction on OCD.