Hi,
owner of a WIIM Pro (with SMSL D-6 or FIIO K7 here). I was fancying the Eversolo too, thus I have some ideas about the device.
In a nutshell, its a decision between independent upgradability and an All-In-One device that allows you local (NVME) playback with a balanced output design as an extra.
... I did not test it, but it seems that you could have your offline library from Qobuz stored in your device ... which can be handy at times ...
From the engineering point of view I would think the Eversolo is SOTA for the majoprity of people who know about this device.
From a hobbyist point of view I would buy it only if I would like to start other hobbies in the near future and keep testing/curiousity in the audiophile hobby at bay.
Wrt to the WII Pro, if your economic situation allows it, I'd suggest you'll go with the Pro Plus because that device has advancements in engineering (weight, analog output stage, ADC/DAC) over the Pro and it would allow you to find out if you can hear the difference between the AKM DAC (inside WIIM) and the SMSL DAC. En plus, you would be not dependend on other devices (that can fail).