Hard copy- if you don't like it you can trade it in. You can lend it to friends. You have something to look at if you lose electricity. takes little space on your hard drive.
Digital copy- You don't have to get up to change the game in your system if you want to play it. It will be locked into your account so you don't have to worry about ever losing it. It may work faster being it reading from memory then a disk.
Both will be the same, one will take you a while to download and the other means going to the store. Depends on your connection, of the store is 30 mins away, then get a hard copy. The game is good so far, but if you don't like it, you can trade the hard