Terry is an offensive-minded, shoot first player, who doesn't pass the ball, rebound, or play defense. Sure he's a gifted and, in some situations, clutch scorer - but that's all he does. He doesn't affect the game in any other areas. Also, he doesn't have the highest BBIQ in the world. I've seen him do too many dumb things. Forget the number or seconds on the shot clock, take ill-advised shots, commit dumb-ass fouls. His situational awareness and how to respond in those situations, leaves a lot to be desired. I've even seen occasions where his teammates give him the ol' "wtf" look. His childish, unnecessary, showboating looks real good when the opposition is running the ball back at him the other way. Also, let's not forget Terry's reputation for dirty, below-the-belt", type acts. There's a reason the coaching staffs (past and present) junked the idea of having Terry as a backup PG.
On the other hand, Manu can affect the game in a variety of ways. Besides his scoring binges, he rebounds, passes, plays the point and can defend way better. He's basically the catalyst for the Spurs second unit, though he could easily be a starter on the Spurs, and any other NBA team for that matter. Manu probably commits more turnovers because he takes more gambles and chances. He also gets his share of criticism for flopping. However, these are criticisms of both hustle and commission that I can live with. Even if this comparison were close, Manu's championship pedigree (at all levels) puts him further over the top.
Sorry folks. In my opinion, this comparison unquestionably favors Manu.