First of all, the two different types of businesses are not all that different. Regardless of whether you are cutting lawns, removing snow or cleaning, you are going to either be taking care of residential properties or commercial buildings. Typically, you are going to do one or the other although when it comes to landscaping, you may find it beneficial to have a mix of the two. The better money is certainly in working for commercial properties, regardless of the type of business that you are operating. The only problem with that type of business is the fact that you will usually have to work odd hours to work around their schedules.
You also need to consider the startup cost of either type of business. If you are starting a cleaning business, you will usually need to contact a janitor supply company and purchase some chemicals and a few pieces of equipment. These companies often provide concession stand supplies and other services to their customers as well. The amount of money that is going to need to be put out for a janitor company is quite small when compared to a landscaping company. The reason why that is the case, is because you are going to have much larger pieces of equipment for a landscape company and you are also going to need to transport that equipment from one location to the next.
In most cases, you are going to be able to run a small janitorial company without having to have any outside assistance. That can be of benefit, as you will not need to worry about employees but it is also going to be restrictive when it comes to going on vacation or if you happen to get sick. If you run a landscaping company, it is likely that you are going to have one or more employees to help you to get the jobs done more quickly and to handle any heavy work that needs to be done.
When it comes down to it, it is really going to be a personal decision as to what type of business you start and operate in your area. It is something that deserves some consideration, however, because you would want to make sure that it was sustainable and that you were going to be able to handle the work on a consistent basis. If you choose wisely, you will find that it gives you much more time and money than you would find if you were working full-time for an employer.