Nobody will tell you a right answer before Leonard will have played a significant number of NBA games...
Batum is more gifted on offense.
On the defensive side i'd give the edge to leonard... But they really aren't the same player... Leonard would rather be a Wallace/MBah a Moute type of player, when Batum is more an all around type of SF.
Not the same mold, definitly... Even if both can play great defense....