I like Tatum a lot, wouldn't surprise me if Danny picks him over Jackson as the all-around better player (and a year younger). The only concern seems to be that he might not get his dribble-drive shot off so easily in the NBA. He has a somewhat slow and deliberate way of gathering himself as he gets closer to the rim.
That said, Paul Pierce had a deliberate way of gathering his dribble drive, so there's that.