I think a chain would come in fairly handy for locking to things other than bike stands, like lamp posts etc but I find my mini fahg so handy, it just slips in a bag and although fairly heavy you don't really notice it too much. I think a decent length of heavy chain and a meaty padlock would be harder to transport so I only use one for locking up at home (in combination with the mini fahg).
I think a chain would come in fairly handy for locking to things other than bike stands, like lamp posts etc but I find my mini fahg so handy, it just slips in a bag and although fairly heavy you don't really notice it too much. I think a decent length of heavy chain and a meaty padlock would be harder to transport so I only use one for locking up at home (in combination with the mini fahg).