I run the Synology through the Oppo when listening to two channel and it is extremely good, no doubt. I will continue to use the Oppo for two channel, probably till it dies and/or can’t receive the support to fix it. It’s really that good. However, the majority of the listening we do is whole house audio or audio by the pool, controlled by iPads or iPhones. The Oppo udp-205 does not have Tidal or Pandora etc. compatibility. My Onkyo Pr-rz5100 processor does everything really, really well in the controller realm, but internet stability sucks. Onkyo fixed the HDMI bugs, but dropped the ball on streaming. Lol!But here is the crux of the decision. Why are you looking at expensive streamers when you can buy a cheap streamer and a great DAC? Or as Spike says above - use your UDP205 as a streamer.
That will give you far more flexibility in the future as you upgrade one without being dependent on the other.
Unless you're looking for streaming functionality that you don't currently have, there is little point upgrading that part of the system - it is just a pipe to get data to a DAC.
So, I would like a good, high quality streamer that we can control while listening in whole-house or by the pool, and can be easily switched between our NAS, Tidal, Pandora, etc..via iPad apps.
I know the easy fix would be to buy a new processor that has a good renderer. I’ve looked at the Marantz av8805 and the Mac Mx122, because i need zone 3 capabilities and that is getting really hard to come by these days. Trying to stay away from laying out $4k or $5k if I don’t have to.
So now, here I am..haha!