It's no secret that Vertex Standard eVerge radios operate in both analog and digital modes. This is an excellent way to demonstrate the difference in audio quality between the two modes on the same radio!
This Vertex Standard video compares the difference between analog and digial audio, and you can definitely hear it. The radio used is an Vertex eVerge EVX-539 Digital Portable Two Way Radio. eVerge EVX radios are available from Buy Two Way Radios.