I'm working on my third neck through at the moment so I can at least tell what I've decided to avoid in my future builds...
The first one, the LP type shown in the April GOTM contest, is a few mm wider than the fretboard end. Making the neck end blend nicely with the top is a PITA to make it look like a feature instead of just poor measuring! It's like carving the guitar out of one single piece of wood. Looking from the neck to the body joint shows more on the bout side than on the cutout.
The next one is a dual cut where I succeeded better with the width of the neck block. Because of the dual cut the fretboard didn't protrude much into the body.
The current build has a top to hide the neck seam but any inconsistency in the neck width would look even worse when looked along the neck. And since the single cut design left quite a many frets over the body, in order not to knock the bass side upper corner of the fretboard off some serious fiddling had to be done.
That said, the next one will definitely be wedge shaped along the fretboard, no matter what the shape will be. The angle is so shallow that it won't affect gluing, neither would the profile suffer.