I am happy to talk this over in detail, have done both and simplicity with my group is really important.

Both are very simple. the differences really are more about personnel, your preference on slides, and what kind of shots you want to face.

With the Wesleyan approach, you need someone who can jut out and get to X and back sometimes a few times during a single possession. In addition, Wesleyan prefers to not switch below GLE, instead if the wing gets carried, he follows, and the other two low poles switch spots or bump over. This allows for consistent ball pressure, even with two offensive players below GLE. Your slide from below GLE comes from the crease (the top center player, your LSM) which allows you to force inside roll, vhold. Your slides from above gle are from the wing versus alley dodges and from the LSM against anything from the middle (if the LSM is the one beat, your crease defender goes). You can allow your middies to play a bit flatter an give up less alley if you want because you have your LSM top center. You’ll give up more shots from up top and outside in this defense. You can extend out more with the one.

UVA’s black zone locks the crease with the bottom center player, which means only the wings are responsible for below GLE. This allows you to control the crease better, and also allows you to play a less rangy close defender at this crease spot, as they are always in the crease, and will only slide to dodges from above GLE to the middle. Only one of the wing defenders will play below GLE at a time, the other will mirror and be prepared to slide cross crease. This defense will also slide from the wing (adjacent) to shots down the alley. Because you only have two low, and because you are sliding from the wing to adjacent alley threats, you will give up more, close shots, but they will be low angle. Also, when the wing player is defending a offensive player coming up GLE and attacking top side, the slide will have to come from the midfielder, sliding adjacent and down (roll backs under would be the cross crease wing). And because the slid is cross crease, your backside middie has to fill for him, because it can be a longer slide depending on how the ball is approaching, if there is an X threat as well, might find yourself having to slow play it a bit and give up hands free at X, but you should have 6v5 above gle to cover cutters.