DAC/AMP or MacStudio for my Neumann headphones?

Hello everyone,

I already asked this question in another forum, but I was wondering if I could reach a broader audience with a dedicated post here.

I currently own the following for listening at my desk:

Mac Studio - Cayin RU6 - Neumann NDH30

As I‘ve read lots of good things about the Mac Studio audio jack I am wondering:

1. Do I really need the Cayin RU6?
2. If I‘d like to spent on a external Dac, what money is required to top the Mac Studio and what Dac comes to your mind? Mojo? RME?

Thanks for your suggestions.