Originally Posted by thdave
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.
All new cables are going to stretch some which is why you need to adjust derailer bikes after a new cable is installed. Once the cable is done stretching, no other adjustment is usually needed. The stretching process may take a little while however. Maybe internal gears aren't that sensitive but I bet you still have something to adjust cable length on your shifter.
Originally Posted by thdave
Chains are cleaner on internal gear hubs since they are typically covered with a chain guard. Also, you don't have to clean sprockets.
That's a function of the bike, not the gear system. There are derailer bikes with chainguards also which would be just as clean. As for sprockets, I don't clean them either. I have no need to unless I pick up a weed while mountain biking.