1-DX11 ( tesselation ) + open cities ( this is only doable for the pc version )
2-tons of different voice actors
3-spears + crossbows and other polearms
4-mammoths, horses and dragons as mounts
5-alot of different, unique armors and weapons
6-alot of hardcoe options ( like having to sleep, eat, drink )
7-werebeasts ( wereworlves, werebears, wereboars, ... )
which one is more important to you?
edit : for some reason i couldnt make poles.