This would've been a nice poll.
Both scenarios are basically the same. Both groups haven't played together but I'm going to assume that with the All-Stars, each and every player will play at the level they played at the peak of their career.
After all that, I would go with the All-Stars. All I picture is the defense from the 31-0 shutout vs. New England. Lot of trust worthy players on that team that still play today as a solid veteran presence. We would have still have a lot of players that are on the team right now like K. Williams, McGee, Byrd, and Kelsay along with other players like Schobel, Sam Adams, P. Williams, Spikes, Fletcher, Clements, Winfield.
I would take this years defense if it wasn't for the fact that we will probably have a rookie and 2nd year CB leading the starting at that position. Lets take the proven players into battle and leave nothing up to chance.