That screenshot doesn't help at all...the settings are under the green "..." button. Here's some example settings.. http://www.donaldphan.com/tutorials/xnormal/xnormal_occ.html
Here's a better example: Also added colored specular (separate texture) to this version. Again, the blendmap uses UV chan 3. Terrain_Blend2_Colorspec_noalpha.fx
"What's the best" -- questions.. are in general un-answerable.. because there is no context.. Here for example... environment for a game, for a stylistic or realistic, background (like in a martial arts fighting game) or in-game place to go.. first person shooter or RPG, multi-player or campaign.. also basic environment or…