Basically, the wider the water surface area, the more likely that the toilet is going to produce the power necessary to remove any and all waste with each flush. This is especially important in a commercial setting where lots of folks will be using the toilet every day. It will help to limit the amount of time that your staff will need to clean the toilets, which is always a plus. A larger water surface will also help to prevent clogs since it will allow the toilet to produce enough power behind its flush to make sure everything goes down.