Driving parallel LED strings
Am I missing any options?


I'd measure the voltage drop across the strings, if it's vastly different (like more than say 5%) then use different CC drivers. If not then it's fine to parallel them. Separating out the strings will allow for better control of the current, but if your not calibrating the LED's or have any requirements, then the configuration probably isn't that important. 

If I were doing this myself I would probably choose A, because it would reduce PCB trace size requirements, allow for easier routing/placement of the CC drivers on the PCB and give better control on each string.