I see that the OP has already decided on the non-R version, but I thought I'd throw in my experience with the R version (only). I have the light mounted on the front right mount of the Velo Orange Randonneur rack on my randonneuring bike (with SON 28). I really like the near field feature, as I find it very useful to avoid road debris (probably because I am not a fast rider). The only times I wished for more light was while doing fast-ish descents on twisty roads. Don't know if the Cyo would have made a significant difference in that case, but my guess is, probably not.
Either version with a good dynohub is a great lighting solution.