The difference is the number of heroes available when you start.
Starter Edition includes six playable heroes (instead of 12), with three fully unlocked. For Honor Starter Edition Steam Altergift Other heroes can be unlocked for 8,000 Steel each (8–15 hours of gameplay, depending on how you play, or $8). Starter Edition includes the same content as Standard Edition, including Story and Multiplayer modes.It is compatible with the season pass and DLCs.