If you have the resources, go for the Signature Series Rendu SE optical.
As you mentioned, it eliminates another black box.
I 'm not certain how it will integrate into your setup. ( optical Module, another box and PS )
I have no doubt that it performs at a higher level than the oR, how much higher is the question.
The harsh reality is that sometimes when you are splitting hairs the sum of your other components and space may be what determines how much of a difference you can/could actually hear.
Speaking of getting rid of black boxes, if you are prepared to go for the SSR ES optical, you might want to take a look at the DCS bridge and then you can get rid of USB also.
I bought into the SSR for I2S to my DAC and I still have it in a second system, USB is not my favorite connection, its a connection that can make or break your sound.