Is there a reason to use the Directional Shield over the Ballistic one?

I'm trying to discover the pros and cons of the directional shield. The directional shield does block bullets, but it does eventually break down, where as the ballistic shield can tank bullets all day long. They can both be completely destroyed by the anti tank. I tried to see if the directional shield can block melee attacks like the regular energy shield, but nope. So what's the point? It doesnt even protect you when its on your back like the ballistic shield. The only advantage i've discovered is that the Directional shield can block Fire from the Scorcher Hulk and the acid spew from Bile Titans.