Is there an advantage in optical transmission with TTL that you lose with radio?

I have an ST-E3-RT and 4 600EX-RTs and that is all I use for lighting. I use both E-TTL and Manual. I always prefer to use my radio for E-TTL but was wondering, is there an advantage whatsoever for someone in my case to ever use optical when all I need is Radio transmission either in E-TTL or manual? Is there an advantage in optical transmission with E-TTL that you lose with radio? I read somewhere that may be the case where the optical communication between speedlights for determining exposure in TTL is more accurate with optical transmission than radio. It may be that the Nikon folks are pushing that thought but wanted to check. Thank you all.
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RezaM wrote:
Thank you very much TCampbell. That's great information. So there's really no reason to use optical if I use 600s with an ST-E3-RT?
To answer the question you've been getting at all along - No, optical offers no advantage that can't be achieved with the proper RF system.   Conversely, there are several advantages to RF that optical lack.  It would be a handicap to use the optical system if you have 600s and a ST-E3-RT.
If you don't have that system yet, but are considering it, keep in mind there are alternate options that are cheaper and can even have features the Canon system doesn't - such as wireless second curtain sync.

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