A:Answer Assuming you mean that one is 32GB and the other is 64GB. This is a measurement of the amount of memory the AppleTV has. The memory is used largely for storing apps you may wish to install, including games. It is also used to store movies you rent and podcasts you subscribe to until you watch/listen to them and to buffer movies and TV shows you stream. Since you can fit hundreds of apps and games into 32GB, that will be enough memory for most people, but if you are replacing an AppleTV that has prompted you to manage memory by selecting apps to delete, you may want to opt for the larger amount.