I care about shooting. I think Polley is, a marginal improvement over Martin as a shooter. He's a massive downgrade as a defender, rebounder, ball handler, passer and overall hustle player.
My logic is that the best guy should start. Sanogo beat out Whaley and Josh at center over time. Whaley started because he was our best 4 with Akok not healthy. With Akok healthy, he is probably our best 4, but they will each need to compete for those minutes and against Springs/Johnson too. Martin or Jackson is easily our best SF, both are far more complete players than Polley. Jackson may get time as a guard as well. Gaffney is, at the moment, our best SG. But Hawkins will compete there, as will Jackson and Martin to some degree. Cole is the best PG, but he has to fight with Gaffney and possibly Diggins for those minutes.
Best guys play.