It's down to personal preference whether to go digital or physical.
If you go digital you can call Nintendo and have them ship the artbook if you want it.
It does come bundled with the physical version.
Personally I am going physical and will pick up mine at Gamestop (only because I have a $5 off coupon and I traded in a 3DS game I didn't really want. Don't worry I only took a $5 loss on the game from what i paid for it).
I also plan to pick up an 8-bit classic Mario Amiibo in the morning at Meijer's (I have a $5 off rewards certificate).
I normally go physical for my games, because yeah I don't fully trust digital to be around later (many games have been pulled off of Steam, PSN and XBLA by publishers) which you cannot redownload if you uninstall them).
I also can regularly find game sales to buy physical at discount (which you can do at most Meijer's this weekend if you are an mPerk member).
_________________
Something.... Weird... Something...