Wartecher

[Dragwind]

When it comes to the defensive qualities, they don't excel over fF at any of them, but they are pretty close.

http://www.pso-world.com/psu-job-percentages.php

Along with the close HP and DFP, you get the added EVP, which means if you don't block a hard hit completely, you can still take the blow quite well.

As for Debuffs, I personally only find myself using Jellen to further decrease the amount of damage taken, which sometimes can mean the difference between getting knocked down or not.

Edit:

This actually caused my curiosity to take a test. Below is the results :

Spoiler!

First I started off with just this setup. The damage taken was about 20 points difference from my capped male beast fF with an Orpa-Senba. Keep in mind this Al-Senba is neutral.









Not too shabby.

Next, I equipped my Orpad / Guard, cast Deband, and cast Jellen on the Go Bajilla.


















So with the combined defensive abilities, you can make a tanking difference if you chose to do so. As far as how useful high defensive stats are in this game at the moment is far and few between, but hopefully the next cup/event might put it to good use.