The Challenger 2009 is reported to be more accurate than the edge.IMHO, the Edge has better potential, if AF can get the accuracy issues worked out. And it may simply be a different barrel spec.
But before we go too far.What kind of shooting are you planning to do?Is it casual 10m target shooting, or do you have ideas of competing in local matches?If you plan to compete, you NEED to find out the rules of the matches. You would be at a severe equipment disadvantage if you were to use the Challenger in a precision class match.