My internal gear hub bike cables have liners and don't need adjusting. Not so on my derailer bike. I don't know if that's just my bikes or not. Also, I'm pretty sure the cable doesn't move as far on the internal gear hub and that isn't as sensitive. I could be wrong.

Chains are cleaner on internal gear hubs since they are typically covered with a chain guard. Also, you don't have to clean sprockets.