For a basic in home bass 300W halfstack that needs to compete with a 150W guitar halfstack, which would be a better cab for the halfstack, 4x10, 2x12, or 1x15? Please include reasons.

Also, can a guitar cab be turned into a bass cab by simply replacing the guitar speakers with bass speakers, or do bass cabs have more to them?

My gear...

Samick Les Paul (AV6VB) Guitar w/ SD Alnico2/JB
Marshall AVT150H halfstack
Schecter Stiletto Elite-4 Bass
Ampeg BA112 Bass Amp