When choosing a shoe deodorizer, you need to consider a variety of factors. These include the source of the odor, any allergies you might have, and how much money you are willing to spend on the product. Additionally, you want to consider how much time you are willing and able to dedicate to fighting shoe odor. This may sound silly, but if the application or use of the product is too time consuming or complicated, you are less likely to use it consistently, and therefore the product becomes less effective.