It doesn't really matter all xbox one games have a mandatory install anyway. So even if you do get a disc copy it will use the same hard drive space. The only plus for getting a disc is if you hate the game you can sell it used. This is the bundle to get I mean its a free game and its titanfall. I put over 16 hours into the beta believe me the game is really fun.
The XBOX was designed to use the cloud for storage and does not require full download of a game to start playing. So in time you will only need to have needed parts of games downloaded to play and full install won't be necessary basically making your hard drive limitless as it uses the cloud.