I've had one devacut and she seemed to do a hybrid of the techniques you mention. She cut some curls right away, and then she got to a point where she did the raking thing and finished the cut that way. I am about 15 weeks past that cut and the shape is holding up really well. I just did that bang trim to boing up the forehead curls, but other than that, it's working well.
High Density, High Porosity, Medium Texture, 3B with some kink

Lo-Poo: No Preference
Co-wash: CJ Smoothing Conditioner
RO: CJ Strengthening Conditioner - HG
LI: CK Satin Roots
Styler: CK Coil Jam
Other Likes: Castor Oil; CK Twist Whip, MD CSC
Dislikes: Wheat Protein; Aloe LIs or Stylers