Depends. Edge is sometimes crispier if I like that hard edge.
But sometimes I just want a softer goo-ier one, and in that case I go for the center.
It's all dependent on my mood.
DUHHHH!
If you slightly undercook the brownies using the all edge pan, then ALL of the brownie slices are center cut brownies.
Your coworker is a moron for not realizing that with a narrower brownie, you can more consistently control the texture across the brownie.
quoted for idiocy:
There's still a center in an "all edge pan." Uniformity is still an issue, and that means the center (even though it's a small center in this case) will be even more undercooked. The concept of edge and center is such that when its perfectly cooked you get a crispier edge and a softer center. It's a preference between the center and edge in such a case. To tell someone to undercook it to get an even more undercooked center... well while it's possible, kinda changes things no?