Roon Endpoint Streamers - Direct Comparisons between Current Offerings?

I too will sing the praises of the Grimm MU1. It is a Roon core and a streamer and is superb as both.  It replaced my Roon Nucleus plus and was a tremendous upgrade.  

No USB output on the MU1, correct?  Just S/PDIF (via RCA) or AES/EBU?

Based on my listening, the streamer/endpoint has more influence on SQ than the server to the point where it seems the server only needs to be competent and reliable.  

This.  Bravo! 

Based on my research (I flirted with going with the Grimm MU1), the MU1 does have USB out, however, the real benefit of the MU1 is only seen with its S/PDIF and AES/EBU outputs. The synchronous outputs receive the benefits of the MU1’s clocking and upscaling. Using the USB output would be a waste of the MU1’s capabilities.

As far as the Innuos Pulsar, its only output is USB, albeit a seriously reclocked USB. Innuos is still in process of getting it Roon certified but it can be used as a generic Roon endpoint.

The Grimm and Pulsar were both on my radar, but ultimately I went with the Rose RS130 after a week long in home audition.

Mitch in trying to address your original post. Leaving perceived value out and just honing on sound quality, my Optical Rendu being served by the SGC Sonic Transporter i7 is my 3rd best sounding rig. My Innuos Zenith M3 with outboard Pheonix reclocker is a clear step up even with Roon. (Like you I have a lifetime subscription) Now if instead I use the Innuos Sense instead of Roon, now it gets way better still. Flipping  between Roon and Sense does take a configuration change and services to restart. (Perhaps a minute total)

I also just purchased an Antipodes K50 which was purchased used within your price range. It does the Roon dance right with lots of user installable HD space, speedy interface and a high quality streamer in one box.

Purely based on the 3 streamers you presented, the Auralic would be my least favourite (on the cold side to my ears) then the Sonore Optical Sig, however the Innuos to my ears is a significant upgrade. Good luck with wherever you land!