Depends on how much someone loves the passing game. I would never argue for anything other than strength on a double 6, on any player.. except when its rolled on a thrower and if that coach loves to pass.Please for the love of god do not listen to anyone recommending Strong Arm ever.
Strong arm (+accurate and pass) changes the whole team significantly, it actually turns humans into a passing team, because without all three of those skills human throwers kinda suck. Humies get decent catchers but the passer can never get the ball deep to them because he's a fumbling f*kwit. Give him SA on top of accurate grants him a whopping 25% accuracy increase, makes long bomba 75% and long passes are now a cinch. Basically it opens up the passing game.
Just offering an alternative option, I'm not arrogant enough to say I'm right, but I feel that personally, how I play, I could get more out of SA than ST on a thrower.