They both let you trigger the shutter without pressing the camera’s shutter button, but they work differently.

• Remote Switch (RS-60E3): a wired shutter release. It plugs into the camera, so it’s reliable and works from the end of the cable, but your range is limited by cable length.
• Remote Control (RC-6): an infrared wireless remote. It doesn’t need a cable, but it must be aimed at the camera’s IR receiver, which is on the front of the camera, so it generally needs line-of-sight from in front of the camera. It also offers a 2-second delay option.

So the main difference is wired vs. infrared wireless. You usually do not need both—just choose based on how you shoot:

• Pick the wired switch if you want a simple, direct connection and don’t mind the cable.
• Pick the IR remote if you want to trigger the camera from in front of it, such as for self-portraits or group shots.