Should I create ZFS zpools with whole disks or partitions?

I am making zpools on FreeBSD machine. While creating zpools I observe these two cases:

1. If I take raw disks and create zpool then I am able to form zpools and they are working perfectly.

2. If I format disks using gpart in freebsd-zfs format and then make zpool then also they are working perfectly.

What I am confused in, is which approach is better for creation of zpools?