I don’t know the Dunu Zen but I know the Odin.
To me Odin is the most coherent IEM I have ever used.
There is no lack in bass at all. It’s bold and impactful and at the same time very well controlled. You have to test to appreciate it really.
If you’re looking for a coherent IEM with massive bass while retaining very good detail and stage, I kindly point you to my review of the new Empire Ears Valkyrie MKII.
https://forum.headphones.com/t/empire-ears-valkyrie-official-thread/5002/6
They are halve the price of the Odin and I really enjoy them.