GreenFig and Higgins ...
My 2 cents:
1) Johnson is a better on-ball defender than Sanders, at this time. Sanders has quicker hands, and is a better help defender than is Johnson, hence the greater number of steals. But Johnson is the better overall defender. In my opinion.
2) Johnson, factually, has a much better assist to turnover ratio. That is simple stats.
3) Item #2 aside, Sanders REALLY is the better passer. I cannot prove this statistically, but I see it on the court. Johnson is a good passer, and certainly does get the ball to his teammates, often in the right spots for his teammates - kudos to him! But Sanders is spectacular with his passing, and sees the court fantastically. You can see it when you watch games. No offense to Johnson, but Sanders has the potential to be an exceptional PG, while Johnson does not.
4) There is no contest at all regarding each player's ability to break down their defender one on one off the dribble: Sanders can beat pretty much anyone off the dribble, using a variety of ways to do so, while Johnson cannot. Johnson does have a very good move to the basket, in a straight line, usually from the wing - and is very quick, and as good or better a jumper than Sanders. But Sanders really has many more dribble penetration moves, and skills.
5) Sanders is also a much better scorer off dribble penetration than is Johnson: He has many different moves that get him shots off the dribble, including floaters, finger rolls, banks shots, and various dispsy-do shots. That said, Johnson has a much better pull-up jump shot off his dribble.
6) Sanders DOES sometimes drive out of control, getting trapped in no-man's land, and turns the ball over as a result. He relies too much, still, on his athletic ability to bail him out of those no-man land situations. But he has been better this year. On the other hand, Johnson too often takes really stupidly timed 3-pointers (like early in the shot clock, from 2-3 steps beyond the arc), when he is merely an okay 3-point shooter, generally - and below average so far this year.
7) Sanders has very little "catch and shoot" game. Johnson DOES have a "catch and shoot" game. By that reasoning alone, unless special circumstances dictate, when Johnson and Sanders are both in the game, Sanders should be the trigger man, with Johnson being the 2G.
8) The Fordham game was a LITTLE bit of an anomaly for Sanders regarding turnovers. He may have been affected by his illness (did he have to miss practice time?). He also DID have trouble adjusting to the unusual and odd location of the Fordham traps (I talked about the Fordham's defensive oddities in another post) - and in response, Sanders was pulled a couple of times, and in the end, Johnson did trigger the offense rather than Sanders. But that was a 1-game thing.
My conclusion: Sanders is the materially better PG than Johnson both due to skill set and mind set. Johnson is a capable back-up PG, when Sanders is out, but is a better scoring guard than PG.