I have beat all the routes in Kamidori and near 100% of all the extra content. Daibanchou I only got past the 1st part of the game. Kamidori I would say is easier if you grind in the deadbeat dungeon, but if you dot go to that area the game will be harder. Daibanchou was really easy in the 1st part of the game but in the second part he game got really hard.
Kamidori is a turned based tactic rpg
Daibanchou is a turned base strategy rpg
They both are fun but it depends on what you want to play at the moment. I would recommend Daibanchou if you don’t have a lot of spare time I got the 2nd part of the game in 2 hours, to complete a route in Kamidori takes much longer.