Jail() vs. chroot()

[A Rossi]

I've been comparing FreeBSD with OpenBSD as of late for the role of web 
server.  I generally prefer OpenBSD because I find it easier to use (I 
like finding the configs for my installed applications in /etc not 
/usr/local/etc among other things) however, jail()-from what I've 
read-seems to be superior to chroot(), which leads me to my question: 
why isn't jail() implemented in OpenBSD? It does look like a massive 
undertaking would be needed to implement it, but code auditing is also a 
big undertaking as well(unless I am mistaken).
I've checked the man pages and the archives and I didn't find the 
answers there (it's possible that I overlooked them too).