Hero 4 is definitely more advanced. But as of now, the 3+ has more accessories. I'm sure the 4 will get there. Like I found this battery pack that hooks into the 3+ and keeps it waterproof and I can get about 5hrs out of it. Plus you can charge your phone too at the same time with it. But it only works on the 3 because of the battery. They have a solar battery too that looks legit, haven't used it yet. They have a new light pole that has usb plugs on it, so when you plug in your back light you have power from it too for your gopro. So much stuff it's crazy. There is more if you have anymore questions on stuff pm me. Picture taking on it is unbelievable, iv turned into a gopro guru. They are amazing! Get one for sure!