Having used both. I can say they both have the moments.
Though what I found most helpful with enhanced focusing type screens is that they had good prism collars and that the camera AF lock was well calibrated since there's no way to have it all(as elliott mentioned). ie. a diagonal split screen is very helpful with horizontal and vertical lines, whereas a standard split screen works well on vertical and diagonal type contrast edges.
That being, I've found that the combination of AF lock indicator with a split prism is usually enough to nail most shots. - but all that pales in comparison to focus peaking though