dhenry:
As a christmas gift I'd like to get a relative either a due or a raspberry pi
You can get a Ruku 2: practically the same thing, but you can get at a retail store like WalMart.
Purpose of raspberry pi: to help people learn and play around with linux and programming cheaply. Can be used as a small and cheap PC that can be mounted on robots and has GPIO. Can do anything a PC can, although slower.
Purpose of roku: to watch movies.
Failing to see any similarities