conquest: is better for me, its challenging, the maps have innovative mechanics and have variety(defend this point, escape with time limit,etc) and the final boss isnt a joke,also, the enemies have skills so you must have care
birthrigth: is easier, have innecesary skills because you can grind, nearly all the maps are the same "kill all the enemies" thing and you can kill the final boss in one turn
revelations: in the intermediate betwee the other two, but it have some <censored> maps like the "sthealth chagenge" and few enemies have skills