I have a CB with an attitude issue, but that may be from circumstances (moved from larger to smaller tank, then tank got ich so had to remove LR, which is just now coming back with algae on it) as from individual personality.
Everything I've read on these fish is mixed. Some say the flame's easier, some the beauty. Some say one is 'aggressive', some the other.
I think the variance within each species matters more than the difference between them.
That said, a 275 is a big tank, so even if one is trouble, the other fish have somewhere to go.