Summus Server from Euphony Audio

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I currently use a sonicTransporter I7 feeding an EtherREGEN feeding an UltraRendu utilizing Roon and HQPlayer.  I have been considering replacing the UltraRendu with either the Summus machine or perhaps a Signature Rendu SE optical with the Tier II upgrade.  I would be needing to purchase a nice power supply with the Summus machine also.  Forgetting the cost difference, anyone have a guess on the better performer?  I do like Roon with HQPlayer but reading various threads the software on the Summus machine is supposedly top notch but I have no experience with.  Suggestions please.