It has a longer hose for a bigger pool and the motion pattern is also for a bigger pool.

An easy way to determine if you need a 2 Wheel Suction PoolCleaner or a 4 Wheel Suction PoolCleaner is to imagine a 40 ft long pool. If the suction port or skimmer is half way (most newer pools) approx 20 ft from one end, then the 2 Wheel Model will be sufficient.
If however the suction port is all the way at one end AND you have a very deepend the 4 Wheel PoolCleaner would be better suited for your pool. The best way to describe it is that the 4 Wheel model can drag more hose.