This is a very common question and does see​m to cause some confusion. They are essentially both methods of implanting pigment into the skin.  The main difference is that PMU is implanted with an electronic device (also referred to as the machine method) which is very similar to a conventional tattoo machine,  whereas Microblading is created using a manual hand tool with a blade similar to a scalpel.

Both PMU and Microblading can achieve natural results, however most people confuse hairstoke brows with microblading.  PMU can easily create crisp, fine, feather-like strokes.   PMU is more suitable for a greater range of skin types.  It can create a variety of brow styles, for example hairstroke, powder or ombré. 

 Results tend to last longer with PMU techniques as the pigment is implanted slightly deeper into the skin than with the manual microblading method.