My experience is still very limited, as I'm still working with my first straight, but it's a square point, and I can tell you what I like about it, and what I don't.

I wear a neatly trimmed beard, and I find that the square point lends itself really nicely to trimming in neatly, especially where my beard and sideburns meet.

What I don't like about it, is that the growth pattern on my neck makes it so a true ATG pass would be horizontal from the outside to the center, and it can be a little tricky to make that pass without that point doing ugly things to the underside of my jaw. Of course, I'm not sure that a round point would be any better.