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NF looks like branded Tenebraex oem or a copy of Tenebraex. Tenebraex are original "tough tough" bulky covers, very robust and strong, but 2 piece screw on affair with a lot of extra bulk around the ocular/objective. You won't see a difference between NF or Tenebraex.
Aadland is a newer and different design from the above. They are better. As per Dark Lord of Optics himself: https://youtu.be/uTpWfsZ1BHM?t=122
For the ocular lens its one of the few bands that spins. You really need that on NF for the ocular lens because the entire housing turns when you zoom in or out.