Adobe over the years have had a number of different ways of tracking
channels and modelling attribution. This one I believe pre-dates
marketing channels. There is no right or wrong answer as to when to use
it (assuming you've got it set up correctly), it's just going to tell
you something slightly different. However in our organisation we've
hidden this variable from users and directed them to marketing channels
for consistency. In terms of the set up of this particular variable,
Adobe automatic...