FMC (which only looks at the runway itself).
The FMC doesnt care what runway you are on, the vspeeds are based upon weight, temp, thrust, slope, wind and flap. The FMC uses the runway information in the navigation module not the performance module.
The options available in the BLT are identical to those available to the guys producing paper charts, its up to the airline to decide if they want to use balanced field, optimized, min v1 max v1 or improved climb.
In our case, we try to use the FMC for V-speeds, therefore we opted to use Balanced field methodology.
Mutt.