Dependable Care machines are the true MTs as they used the ol' faithful helical drive system. It is a helical drive machine per-se, but the only difference between a machine from 2005 and one from 1965, is the transmission (helical/pitman, and orbital receptively). These machines are also the "two belt" models. One belt for the wash drive, and the other for the pump.
"Amanatags" or "Norgetags" are the "single belt" machines, with one belt controlling all of the components. The set up is decent, and they could be solid performers, providing they didn't leak. In fact, most of the machines that were "AmanaTags" or "NorgeTags" did wash well, and could be nice machines. Lets talk about the "could be nice" for a second. In my mind, Maytag really frigged up with the launch of the "Atlantis" line. The first Atlantis machines were beautiful, excellent shapes and curves, huge lid, huge tub, lots and lots of features. The Atlantis was the higher end marquee for Maytag (I think the higher end marquee should have been the helical drive set up). The problem was, they used the Amana/Norge drive system. And then as the machines got further and further into the production run, they cheaped out by using plastic tubs, and crappy control panel components. They also used the Amana/Norge drive system on the lower end marquee known as the "Performa". Infact, the Atlantis lineup at the start of their production used a pure Maytag dryer, and a Amana/Norge washer. The Performa line up used all Amana/Norge washer and dryer set ups.
As for the Neptunes, a lot of the machines parts were sourced out from Samsung. These were also very nice machines, and very solid performers, but they did have their Achilles' heel, which was that wax motor in the early machines.
MayPools or Whirltags are simply the name for the top load machines WP manufactured (after the acquisition of Maytag, and discontinuation of the entire Maytag lineup) and then cloaked them with the Maytag name. These were true Whirlpool Direct Drive machines, with a Maytag badge.