The *core* of these games is really similar, but Barony plays different than Delver - it's rather slow paced, features more complete mechanics (including character development similar to Elder Scrolls series), also I think that gameplay is more rewarding. Barony is also more polished (especially in terms of balance) than Delver, but unfortunately it also has own quirks - like strange mouse control (you can move only horizontally, it feels weird for me) and other details.