The wireless one is great if you are going to be standing in front of the camera, say to take a family photo with you in it. But for things like fireworks and stuff where you are usually behind the camera, it does not work as well. You have to put your hand in front of the camera and point the remote at the sensor on the camera. I've never gotten part of my arm in the shot, but it could happen. Its more inconvenient than anything else.
But while its inconvenient, you can't really use the wired one for family shots. So if you are going to only get one, and you plan on the occasional self portrait/family shot, go for the wireless. But thats what works for me, YMMV.