Best pairing for HD600s + Tidal MQA

If you're switching between speakers and headphones a lot, the M500 is the obvious choice over the others, as it's one of the surprisingly few devices with an output switch (double tapping a button on the remote switches between headphone and pre-out).
But if you don't need that or its other features then know that it won't do any magic to the sound that a cheaper unit wouldn't.

MQA is just worse lossless.

This post has been removed. Please note the following rule:

Rule 2: Ask purchase help questions in the Shopping and Setup Help Desk ***

Requests for product opinions, comparisons, and general purchase advice must be made in the dedicated Shopping and Setup Help Desk instead of a new post.

If the above link leads you to the wrong place: the post can usually be found on the top r/headphones, and titled Shopping and Setup Help Desk.

You may also use r/headphoneadvice but please search their resources before posting.