Ouch, from +4 to +0? 4 downvotes and no negative comments? I tried to keep it as objective as possible, so I'd like to see where there error in my thinking was at least instead of blind downvotes. But oh well.
I think another pro to Talon is he is straightforward. Zed? Not so much. I have never seen so many people fail at a new champion has I have seen today. I played him in a custom game and I had to sit there and read what the heck his ult even does. He's got an incredibly high skill cap while Talon can be played much easier mid lane if you are experienced with melee mids (Diana or Akali is a good transition into Talon mid. I was able to pick up Diana easily with my experience playing Talon).
Unless you can master Zed, I'd stick with Talon mid lane. Don't screw over your team. He has a high skill cap, maybe the highest in the game. (More than Xerath, who people claim is the hardest champion.)