I've wondered the same thing between the SLC and EL binos, From the research I've done they say weight is also a factor but everything I see they are almost the same. The SLC's are also better suited for using with a tripod due to their shape.
I have the 85mm razor and love looking through it but it is big and heavy to carry. I also have the smallest razor for backpacking. So if I could choose just one I'd probably pick the 65mm right in the middle.
Wow, awesome article very informative, and the pictures really show the similarities. I have both kuiu and stone glacier as well and am eager to really put each to the test.