That's pretty subjective based on your build and your playstyle.
I went with L / Front S-Roll for GU/RA, and I like it a lot. I also went with R / Critical Strike Ranged and... I suppose it's nice.
I couldn't begin to tell you what to use for RA/BR. I didn't even realize RA/BR was still a thing. But then, the only time you will ever catch me on RA main is if I have to be (i.e. levelling RA or earning cubes for it).
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