It would seem the deal would be more or less a wash, with slight improvements for you in blocks, 3PTM, and TO with declines in assists and rebounds. If that suits your needs, it would seem to make sense.
That said, the reason I'd probably pull the trigger, even if I could't squeeze just a little more out of him, is that Paul George is the best player in the deal. He's struggled as the primary scorer thus far with Granger out, largely because he can't quite create his own shot. If he ever improves to be league average in that regard, or if the team alters their strategy to get him better looks, he could improve enough to become a top-20 player. I think Parsons and Vasquez have shown more or less what they are, at least for this season.