Neither the Mojing 3 nor the Mojing 4 has a control button, meaning that Android users would need to get a separate controller, and iPhone users would be limited to look-to-activate apps and virtual reality videos. Still, the Mojing 3 would edge out Mojing 4 for comfort alone. The strap design and padding are much more comfortable, and the headset has an adjustable focus. The Mojing 4 does not.