Originally Posted by 1brAPTbrewer
Look at the aa% on the bag. That will tell you the difference.
+1 -- all hop forms are not created equal.
I used to only use whole leaf, but recently switched to pellets for a few reasons. First, for big, hoppy beers, a kettle full of whole leafs is a pain in the ass. Second, I've started buying hops in bulk online and basically can only get pellets. Third, pellet hops are more stable in long-term storage.
From what I understand, most people cannot tell a difference in flavor between the two.