i would go for player a as the better offensiv option
About the shot percentage, i would say good shooting don#t need necessarily good percentages for this player - because a superior scorer who take a lot of shots and even more difficult one. the same goes for weak Scorer, they take pretty less shot, but the percentag, must not be weaker then other players.
But if you have good scorers your team could get better shots on every atack, and won't take that much difficult shots.
and what if the JR will be atrocious. would the player have a high percentage shot.
for a C or PF it will be ok i think, but for the other positions i would go for a more balanced shooter(mabye 25% more JS then JR)