There's no difference. When I was trying the different manufacturers' track and roadbed offerings, I tried WS - both the roll and the pieces. Both worked well, but I ended up not using it as intended. I mounted the track (Gargraves) directly on the homasote table top and then cut the beveled edges off the WS roadbed and glued those edges against the ties. That not only cut down on the amount of ballast I needed, it also lowered the overall track profile. I haven't figured out what I'll do with the leftover remnants, but I'll figure out something.