I have an idea. FPM (feathers per minute), which factors in the time taken to finish an epic battle to give a better picture of how many feathers you recieve inside a certain type of feather drop eb. The formula of FPM is: FPM=average feather drop of an eb/time to finish that eb
Reckoning gives the cheapest and easiest feathers. Best feathers still come from HtE while rotwb is a close second. But they cost money to run
FPM of EBs (Using 10M CS clan and current data) Revenge of the Warbeasts: 400f/1m = 400 fpm The Reckoning: 400f/20m = 20 fpm Haunting: The Escape: 500f/20m = 25 fpm
The Sleeping Giant: 450f/900m = 0.5 fpm In essence, the best feather drop EBs are the ones which need IAPs. Good thinking, devs. Tempting IAPs with huge feather drops.