I have both digital and analog. There is a big difference between the too, namely the digital can be programmed based on your application. I mainly use the digital because it does not amplify the sound of me walking which would drowned out other sounds. The analog is great if your just sitting as all sounds are amplified equally. There is also a big price difference between the digital and analog.
I like Sportear, which is available from Cabelas and Walmart.