Both anime are very similar both are adapted from a Visual Novel game and the Female MC is around handsome guys and she very confuse and scared and doesn't know what to do. Similar to the First Diabolik Lovers
The female protag in both series are rather lifeless and dull while the males in the series are full of colour and the series tends to focus on them as they're "attractive" selling points. Both are mostly made for fans rather than the content.
They are both reverse harems. They have supernatural stuff, in Diabolik Lovers it's vampires, Dance with devils it's devils, with some vampires. I think if you like one you will probably like the other. In my opinion Dance with Devils is better though.