As you can see, opinion varies as to which a particular individual prefers.
It should be noted that many of the screens are very similar with only minor variations, some that don't affect focusing:
B & E: identical except the E has grid lines for framing.
A & K & J: same but different. A=horiz spit, J=microprism, K=combo with the A's split wrapped with a donut area of J's microprism.
Personally, I like the grid lines so I ignored the B and used the E as my primary screen in both my F3 and F2, but generally used a older A in my F, usually ignoring the split and using the matte area beside it. In all cases, I frequently framed first and focused the subject wherever it was placed, often off center and thus ignoring any central focusing prisms. My F was usually my fast film / low light body so occasionally things were too dark to use the matte area and I resorted to the center split prism.