Are there to the gameplay? I got the free offer from Playstation Plus, yes it would be cool to have a physical copy so others can play it, but I want to know if there are any differences from retail vs digital.
This physical copy comes with Heavy Weapon and Peggle. And, being a hard copy, you can enjoy it with friends even if a power surge fries your HDD. Besides that, there really aren't any major differences.
If you're not interested in the other games bundled with, it's probably easier to just get the one game you want.