I run Roon on Pi/Linux, Windows, Meridian, MacOS, iOS, Squeezeboxes, Airplay, Chromecast and Android and have not experienced any issues. From my perspective, it’s affordable and benefits from economies of scale in development and excellent support too.

Saying all that I would be interested to hear how you feel that Roon is at a disadvantage for being platform agnostic as I've not been a Sooloos user, having moved from a Squeezebox streaming solution to a Roon and MS200 setup.

Cheers
Tom

Main: G61SL, 218, HD621, 2*7200SE, 7200HCSE, M6s, DSW, Apple TV 4K, NUC (Roon server)
Secondary: Wiim Pro, 3200, Audio Core 200
F80