Well Roon claims to be very well structured around composers for classical so that is a plus. But what sources are you wanting to stream? Your own files? Spotify? Tidal? Amazon? YouTube? Others? Also what other devices do you have that you might want to cast from? Sources and protocols the streamer can support will come into play. It can be very confusing but varies a lot among streamers. One of the reasons I am not too quick to make a jump quite yet personally. Features in general can vary widely especially when factoring in the app choices for use. Way more than absolute sound quality, which is best addressed via the dac you choose to use with the streamer. Could be internal built in or external.