The eversolo does have fair bit more features like cd ripper and encoding, screen, also believe it can act as server and dnla service, internal nvme, usb port for HDD, more inputs and outputs, high quality psu and dac. Plus being android has bit more possibility. If it was open source firmware allowed you to install own APK etc, or menu systems but they probably won't allow that.
But it's fair bit more expensive. Plus if you don't need those features then paying several times for something never use. IE if you just want a streamer and using digital out then pointless spending one with high end dac and audiophile analogue section.
Personally the screen is really the appealing thing about for me.
I own never wiim or eversolo. Still trucking on with LMS Squeezebox touch.
If wiim made a streamer that had scanner/service (basically like lms) would be great addition, maybe release a wiim with faster CPU/memory etc to be able to compete with raspberry pi and Nas. Realtek CPU in my ds418 is plenty fasr enough so that in ultra with dnla service would be worthwhile purchase, not everyone has a nas
That way have wiim ultra + HD in main room, the. Wiim pro in other rooms using the ultra as the host dnla server