Tactics is like Disgaea but better in every way. (And I do love Disgaea). The job system is similar to FF5. You can turn any character in to any class. However, instead of having only one ability from another class equipped you get an action ability, counter ability, character ability and move ability. So there are so much more ways to mix and match abilities from different classes. Also abilities are learned by spending experience on them, so you can chose to save up JP and only learn the abilities you want from a class without having to level the class up to the max.