That totally depends on the yard size that you are going to be working with the leaf blower. If it’s a big yard, you should get a higher CFM to get effective results. The cubic feet per minute tells you how much effectiveness you are going to get out of the leaf blower. But as you go for a higher CFM, it’s going to cost you a lot more. So, that’s something you need to be aware of before choosing the CFM. Try to go with what you need, it’s going to give you the best value out of your money.