For my vortex post: The absorber serves a very specific function it soaks up water (it absorbs

) A microfiber, on the other hand, can do many things exceptionally (shine crome, QD, remove wax or Klasse, windows, dashes, plastic, and more) as well as absorb up to 9 times its weight in water. Some of the plusher microfiber towels have more "give" and pick up particulate better than the absorber which is a definate plus to the car enthusiast.
A typical combo involves using the absorber (or a waterblade) to do the first pass (on a very clean car) and then a microfiber with quickdetailer to finish up the job to a perfect shine.
Following this concept both can coexist in the market place
One thing that is a big scenario to watch out for is QD or drying a car after a rain. For example: say my car has been out in the rain and all I want to do is maybe rinse it down and wipe it down. If you use a water blade or an absorber there is a great chance you'll get swirls from this; there's just not enough give with the products.
At least with the use of QD and a miracle towel it won't scratch it as much cause the lubricity of the QD and the plush of the towel will help you out completely. Only use the absorber and the CA Blade after you wash your car. Any other instance, you'll need to use the miracle towel. Now if you're willing to use both then do so, I myself use a microfiber to make the first pass and a second one for the last pass. It's simple, it's not that expensive, and the QD and towle is like insurance in most cases.
Hope that helps, Steve