Does anyone use a split shot rig? If so, where and when?

I hear a lot about drop shot, so I didn't know if this rig was superior all the time, or if there were circumstances where the spit shot rig was a better choice.

I'm guess it would have to do with if the bluegills were on the bottom or suspended a bit. Also weeds (split shot might be better with fewer weeds, on flats)?