The main issue with ADF is that it's unsustainable in the long run so is more like dieting - ie, when you stop you'll probably put weight back on. The beauty of 5:2 is that, although slow, if you like it you can carry on doing it for forever and the weight doesn't come on.
I tried 4:3 when I wanted to speed up some weight loss but I just found I ended up eating more on non fast days so seemed a bit counter-productive, and unsustainable.
Currently in my 11th month of 5:2, at maintenance weight and no plans to stop doing it.
No harm in doing ADF and Dr Varady's evidence-based research into the efficacy of fasting is based on it; but I doubt it's sustainable - too much like deprivation which will see me falling off the wagon in no time.