I think you keep both. Realistically on a good team both of these players will be on the 4th line to make a line of Boyce/Brent/Brown. However it is still unknown if Boyce can adjust to playing wing from center. This is very tough thing to do but watching Boyce play I think he has all the attributes suited for a winger (Mainly speed.) If Boyce cannot adjust to playing wing then I think he would be perfect as the 13th skater.