Well as you and I have discussed before, ROX for certain. If you bring it in, people will buy it. As for the other choice .. I don't know what the other 3 choices are.
I wouldn't even entertain any of them if you had the ROX.
If I were selling though then I'd look at it two ways: ROX and lignite or something that you can't get just anywhere (any LFS can sell you carbon, but who sells ROX as it is). Or alternatively, ROX and then some cheaper alternative for the budget-friendly alternative.