Final answer:
The important features to consider when comparing P2P apps are user interface, file transfer speed, and encryption level. Device color options are not relevant as they do not affect the app's functionality, performance, or security.
Step-by-step explanation:
When comparing P2P (peer-to-peer) apps and services, the most relevant features that should be examined are the user interface, file transfer speed, and encryption level. The user interface is vital because it determines how easily users can navigate the app and manage their files. File transfer speed is critical for the efficiency of sharing files, and a good P2P service should provide fast speeds to facilitate quick downloads and uploads. Encryption level is also important for security as it protects the data transferred from being intercepted or accessed by unauthorized parties.
On the other hand, device color options are not an important feature when comparing P2P apps and services. The color of a device does not affect the functionality, performance, or security of the app, which are the primary concerns for users when selecting a P2P service.