TBH, unless your training load is high, then you will get the same benefit from either. So do as you wish. As your training load increases, the benefit of recovery rides increases (I am not sure of the mechanism behind this, so won't pretend I do, but I have read this suggestion from enough reputable sources to assume there is some merit in it).
If you do go for a "recovery ride", do it right, get in the small chainring and the easiest half of the cassette and ride around at embarrassingly slow speeds. Most people do not do it right, they don't ride easy enough to promote recovery, yet they don't ride hard enough to stimulate training adaptation, i.e. they are wasting their time!
Also, don't base recovery rides on distance, base it on duration say, 30 mins.