Both technologies exist. You can do 180 VR 3D or 360 VR 3D. But the resolution needs to be massive to make a 360 VR 3d Image look good.For me, I’d rather freely pan around (look where I want to look) in 360 degrees than be limited to only a limited view out front… but perhaps that’s just me.
Most immersive video content for the forseeable future will focus on 180 VR just due to resolution and bandwidth. Even the best Cannon VR creator kit camera and fisheye lenses don't really look that good to me.