In Blender 8-bit means per channel color depth, so 8-bits per channel. That's a standard texture. 16-bit means 16 per channel, and it used mostly for alpha masks/brushes. Unity does have a specific 16-bit format, because it's a grayscale format(mostly). All textures are 32-bit textures, but some like JPG or PNG are…
I am importing 3D objects from blender to Unity, trying to create a scene, and for simplicity I am creating the textures in blender also. The manual in blender states as I understand that the images are saved in an 8 bit format (if the 32bit option box is not checked), which is ok, cause I am not aiming for high detailed…