These are just some of the things that players should take into consideration before they decide which Faction they want to go with. If they started with an 'Evil' Faction and they want to change, they can only select a Faction from the 'Evil' side. That limitation is that they cannot switch sides. While players have the option to change their Faction if they wish to do so, there is a penalty and also a limitation. That's the first major generic difference when it comes to Factions. Meaning, an 'Evil' one won't be available to a 'Good' Faction. That plays a key role in the context of the game because even though players are able to recruit many Commanders, these units are exclusive to their side.
The 'Evil' ones who have sided with Sauron, and the 'Good' ones, the ones who decided to go against the Dark Lord. As The Lord of the Rings: Rise to War stays true to the original story from J.R.R Tolkien's books, Factions in this game are divided in two sides.