I would choose Gordon also. Randle is a perfect pf for the college game, but could struggle in the nba on both ends. Or maybe he might do ok. He is actually a good post defender and hard to move, on the offensive end he was usually going up against 3 guys (even though at times he didn't have to do it).
So what happens then in the nba when only 1 guy defends him, can he pull an Al Jefferson consistently?? On the defensive end he might be strong enough to not give up position and neutralize his man.
If Randle had a decent jump shot like a David West or Ibaka, i would probably choose Randle then. Actually Randle would easily go in the top 5 then.
It would be interesting to see what happens inside the celtics war room and with the other 2 or 3 teams picking in the top 5 , if both Randle and Gordon all of a sudden look like sharpshooters at the private workouts.