I can't comment on the market for podcast apps in the Android Market since I don't own an Android phone but I do know that there are a number of podcast apps available for the iPhone. I've personally purchased two within the past couple of months, SimpleCasts and Instacast. I'm not really in the market to buy a third one when I've got two already.
I don't know when ShiftyJelly released their podcast app initially but this might be another reason that their podcast app doesn't sell as well on iOS.
I don't know when ShiftyJelly released their podcast app initially but this might be another reason that their podcast app doesn't sell as well on iOS.