With the team as it is, I think that Calderon
is the better fit.
This is because the Raptors
have so few players that can consistently find teammates for good shots.
If the Raptors
were to get a player that can effectively distribute from another position (Iggy), then I think that Lowry's defense and driving to the basket would outweigh his shortcomings as a passer, and in that situation he'd be the better fit.