Without doubt, my vote is instantly going to Edge because he's everything he is - to me. However, I'm going to lend a hand to Bobby Roode here in helping people to evenly look at this.
Bobby Roode has accomplished something Edge never could - and now, never will. He held the Heavyweight Championship (of his Company) for longer than anyone else in 'said' Company. Furthermore, he's held the Championship longer in his first reign, than Edge has in any of his. Infact, Edge has only once held the Championship over 100 days. Bobby held his for 256. If anyone deserves to give him a run for his money, (no pun intended) Bobby has the abilities to win here.
Now, yes Edge had tougher opponents and more challenges, however the fact remains Edge was a top figure in the WWE and just couldn't hold the Championship very long at all. Bobby Roode became one of the most hated figures in TNA, and held the Championship almost 1-year.
Roode has the technical ability to match Edge, if not surpass him. Roode has the in-ring smarts to out-wit Edge at every turn, and that's exactly what this will come down to. Who can out think the other, in a game of wits and cheap tactics.
I'm picking Edge because I simply am. I'm playing that card. However, if Edge drops to Roode in round 1 - I wouldn't be surprised; and Roode would deserve every bit of that victory. Him being ranked 28th is a joke in its own right.