Just as analogue connections can be RGB or YPbPr, so can digital connections, and for just the same reasons. RGB is used for capture and display, and component is used for storage and broadcast.
Both are used at some point in the replay chain, and which should be used for the interconnection will depend on where the better transcoding is performed.
If the player has the better transcoder, then you should use RGB, etc.
If it makes no difference, then, well, it makes no difference.
Nick
