As a owner of a couple omens you definitely want to go with a medium...the medium heavy has way too much backbone in my opinion for a pond. I used my medium heavy yesterday and I damn near literally ripped the trebles out of the lips of some of the fish. Great rods!
There ya go. I don't have personal experience with Omen. I do know that Falcons tend to fish softer than the power rating. They do measure close to power averages based on the G Loomis "standard". But just fish lighter than they are.