i think your main decision is whether you are happy using tidal (and thus tidal connect) to handle all your music streaming needs... if so, you don’t need roon...
roon’s value is in integrating a variety of digital music sources - streamed as well as localized and computerized... think of it as a smart librarian that organizes all of it from different sources so you can see and choose from all of it, from various sources, in an easy to use, easy to understand manner, with nice photos and descriptions of each piece of music - the price of this of course, is in the subscription, and the cost of having a computer running to gather and coordinate all that info, plus send music to your endpoint/dac - you go that route then you need to spend more $ to do it right, keep your network and signal transfer noise free...
tidal connect does all that at your streamer, but of course, it only deals with organizing your music (favorites, genres, artists, new releases) streamed from tidal itself