I've been wondering the same thing. Both are difficult! lol.
I think it comes down to where the docking is easier. I think in an ideal world you'd have a mining facility on the ground with loads of kethane storage. Land another ship on it (docking) which has lots of normal fuel capacity, transfer it all into that, then fly the fuel into space to a main station?
Not sure whether having the tanks on the opposite side of a docking node will let it work properly though. Shame there isn't a way to start with some kethane on Kerbin to have a quick test of the fuel transfer and so on!
I think it comes down to where the docking is easier. I think in an ideal world you'd have a mining facility on the ground with loads of kethane storage. Land another ship on it (docking) which has lots of normal fuel capacity, transfer it all into that, then fly the fuel into space to a main station?
Not sure whether having the tanks on the opposite side of a docking node will let it work properly though. Shame there isn't a way to start with some kethane on Kerbin to have a quick test of the fuel transfer and so on!