Dray Blatche would likely turn out to be Vin Baker with a friendly contract. It's just pretty clear at this point he is not fully committed to being a professional basketball player. But from what I can gather, he is universally liked by everyone that knows him.
No one questions Evan Turner's commitment to the game, but it's not clear how his attitude is accepted by his peers. The Pacer's locker room is probably not the ideal petri dish to test this out in, but things went real poorly for him there. And it didn't sound like there was a loud chorus from the Wiz when he was dealt last year.
But for Boston to profit - they only need production, and Turner is way more likely to produce consistently given the opportunity.