I recently reread the chapter in Blackjack Attack on SCORE, and it covers the differences between counts a bit. Deeper penetration and a higher spread will get you much more profit than the difference between these two counts.

After looking at the SCOREs, the major deciding factors on which count you will use are (1) how complex the count is to keep, especially when also trying to maintain cover, and (2) what game you are playing. PE matters more in a SD or DD game than a shoe, for example. Personally, I am tempted to check out Halves.