For batoning I feel that a flat spine with "slightly" rounded edges is ideal.

If the edges are a perfect 90 degree instead of rounded you can eat up your baton if you are not perfect with your swings. My Battle Rat has a "slight" rounding on the edges of the spine compared to the perfect 90 degree angle on both Dogfathers.

I may take a belt grinder to the spine of my DF LE to take off the hard corners. <img src="/ubbthreads/images/graemlins/laugh.gif" alt="" />