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.68 is smooth and easy.
.95 is medium aggressive and provides a closer shave while still being smooth for the efficiency you are getting.
The Slim is by far my favorite. It shaves the closest of the three and provides some nice blade feel without being too tricky. It's still very smooth if...
After reading the replies here I fired up my Rex. I shaved mostly on 4, did some touch ups on 5, but smoothed out my chin line on 2. So I guess "none of the above" applied to this shave but it worked quite well. The Rex was smoother than I remembered.