I don't know about the other solutions offered, but the best feature about Roon for me is that, assisted by, but not exclusively because of, its almost seamless integration with Tidal, I am enjoying a much more diverse selection of music than I previously listened to, other than on radio. This diversity is not me choosing other artists etc, but because Roon offers it to me based upon what it thinks I will like and not just a random selection.
The other thing I like about Roon, is that it allows me to use a selection of audio endpoints that I have accumulated over the years. Quite the opposite of what I thought was Sooloos' biggest drawback. If only Sooloos had allowed USB audio to be played from its core and/or store/control devices...
Its too subtle for me to describe, but Roon is much more than a media player, with or without Tidal.