Scanlin is good defensively, reads the game well, and is positionally sound. He's lacking for offense and lacking on physical tools (speed, agility, shot, passing), but serviceable if need be.
Robertson still handles the puck like a grenade and is a faster skater, but not very agile yet. He's physical and has a decent shot, but won't get in position enough to use it in the AHL and is guilty of some horrific turnovers.
Scanlin is fine for AHL depth and one of Hartford's better defensive defensemen. Robertson is a potential two-way physical defenseman, but he's plateaued the last couple years and needs to get over the hump if he wants to take his career to the next level.