Breath of winter adds
* A brand new challenging single player campaign with over 30 hours of gameplay
* 20 new magic spells and enchanted items
* Many new impressive enemies like Fire Angels, Werewolfs, Draglings and giant Ice Dragons
* 100 new items
* Cooperative Multiplayer: Free game can be played with up to 3 players cooperatively over LAN.
* Now you can cast non-human heroes like Orcs, Trolls, Blades and Elfs to guard you
* Spectacular rendered Intro and Outro
* Awe-inspiring 3D graphics with zoom levels from isometric to 3rd-Person-view
* Free game: The player can choose from a wide selection of maps that have been modified for this new mode
and Shadow of the phoenix adds
* Two new units & buildings per race
* Siege units & fast moving swarm units offer a new layer of tactical depth
* Extensive single player campaign with 40+ hours of gameplay
* Avatars can now reach Level 50 & 40 new powerful abilities & spells
* Use your Avatars from SpellForce- The Order of Dawn/Breath of Winter
* Dozens of new enemies & spectacular boss monsters
* Over 150 new items & 27 powerful set items
* Ten new multiplayer maps & 15 Co-op maps
* Now Co-op will feature Quests for the players
Information was taken from the amazon expansion pages.