You can play with split screen on Xbox one version.
Split screen feature allows players to play with up to four players at the same time on just one Xbox One console.
Enjoy Happy Wars with families and friends.
*There is a party system in Xbox 360 version; however, there is no party system included in Xbox One version at the moment.
Moreover, you can see significant visual improvement on Xbox One version.
You can also use specific features only on Xbox One such as Snap and Game DVR.