I think both the B and L models would be called "compact utility" tractors, meaning they are smaller and lighter than a farm utility tractor. More optimized for rural property work (mowing, digging, clearing snow, maintaining roads and driveways, etc.), rather than farm work (field work, hay and feed chores, etc.). B's are smaller than L's. Also there are "standard" and "full-featured" models of B's and L's. The delux L's are called "Grand L's", but they don't have a "Grand B". I gave up trying to figure out the model numbers; you about have to read the specs to see what any given model is.