You can look at your choice of dryer in a couple of simple ways. One is to consider how much food you want to store based upon the expected length of storage. The other is what you are going to freeze dry.

In the Cannabis business, we encounter growers who wish to preserve the natural health oriented compounds in the industrial hemp products for longer. These users of a Freeze Dryer are more likely to use a larger capacity unit (such as a medium or large).

If you are preserving foods for a family of four with a target usage of over a two month period, then a small may be just right. If you are looking to prepare foods for storage for a longer perioed or for more people, then the large would be a suitable choice.