Thinking more on this thread - I have 3 Dashers now, and 3 6mm Creeds. So in your shoes, I'd probably get another 6 BR, OR, I'd change the 6 BR to a BRA, and get another BRA too. Even if I was shooting something like a 60grn Column bullet for short range in a slow twist barrel for the BR, and wanted to shoot 105 Hybrids in a fast twist for long range with the BRA, I'd default that whatever case I liked better, I'd like better for both purposes... Hence why I have 3 Dashers, instead of a Dasher, a BR, and a BRA (which would actually be easier to keep segregated than what I'm doing currently), and why I have 3x 6mm Creeds, instead of one Creed, one XC, and one GT... And equally, I have 3 and 3, instead of having 6x 6mm GT's... My match scores wouldn't know the difference - even though my barrel life WOULD know the difference - so none of them are really a wrong answer for anything I do, but I like the Dasher case, so I shoot 3x Dashers, and I like the 6 Creed case, so I shoot 3x 6 creeds too.
Neither BR or BRA will be a wrong answer, but I'm not certain there's a clear reason to not have both be the same, nor to have both be different.