Almost embarrassed to ask, but...

Oppo and Marantz are both directly addressable as streamers. Both use UPNP and HEOS. I use both and often compare them. I find my Marantz 8805SE performs better than the Oppo205SE.
I've also wired the Oppo’s analog XLR stereo out to other amps Including the Marantz as analog stereo inputs, and using RCA to my PassLabs XA25.
All whilst happily streaming Tidal via the mConnect Lite app.
And I’ve used the Pioneer N70ae Streamer and a PS Audio PerfectWave DAC with Network Bridge Streaner DAC in this HT system. And earlier, a Cocktail Audio X40 Streamer.
All in, direct to Marantz via HEOS or mConnect Lite is best for using my HT System as a music player.
I have a separate stereo system with streaming, SACD and other sources.

I stream to my Oppo 205 using a lap top- USB -Roon/Tidal-into a tube preamp then into a solid state amp and it really enjoy the music!  I’ve tried the Oppo 205 direct into the amp but there is something about the tube preamp that is more statisfying.

@taheeti May I ask which preamp are you using?

I stopped in to my local dealer on a whim, just to see what he had. They suggest digital out from the 8802a pre/pro into the Oppo is the most seamless, then Ontario the streaming with phone/tablet as I do now. I listened to a PL Evo400 pre they have setup into a SS power amp and it sounded really wonderful. Reviews on that pre support my theory that adding a pre could very well improve the experience, as I’m hoping. Now to decide on the pre amp....

That EVO400 would be the upper end of the budget, 4500. I have no previous experience with tubes. I am not a hobbyist, I have no interest in the rabbit hole of tube rolling, but the idea of a tube pre is one I’m open to. Not wedded to, but open to.

I just went through something similar. I switched to Roon + Tidal. I purchased a Roon Nucleus( they are may other servers option to use Roon) that is feed into my Oppo 105 via USB, Oppo feed Into my Marantz SR7005 via analog. Very happy with results.