I love the tracking part...I've done that for years. Having something I can do the for the rest of my life easily, is a top priority for me. Primal fits that easily...pretty basic, eat plants and animals. I can do that anywhere. EMF fit pretty easily as well, though I think that could easily get out of hand where I don't have control over what types.
I travel some when I can, and so having something I can do while traveling is a great thing for me. I wasn't sure about ADF, but I was thinking about it this morning, and really, when I travel and won't be able to track, on down days I will just go as long as possible between "meals" and then eat lightly and primally.
And, further, that actually might relieve some of the stress that I've had about travelling because I just won't have to think about eating on down days, lol. I have Celiac, so for the last 7 years when I travel I DO have to be diligent about what I eat, and it's been stressful because of not knowing what to eat in strange cities, sometimes foreign cities. But if I don't eat at all, well, that takes care of it, lol.