My first post on this site (long term lurker) and decided I'd comment here. A front stinger is primarily designed to prevent a forward roll on steep descents. Often folks are putting them on just for looks without knowing their purpose, however I have seen them work admirably in more extreme rock crawling. Think of a situation where you take a very steep ledge and your wheelbase causes your rear end to be near the top of the ledge just as your front end hits the bottom (or close to that). The compression of your front end as it hits bottom may cause an unload in the rear pitching you forward - the stinger will either prevent a forward roll, or will cause your forward roll to tilt so that you don't land fully on your lid but more to the side. I've seen them work, and if you're into that type of action you'll never regret having it. However, if you don't think you'll be there - then it's up to you whether it's for looks or not.
On the other hand, you can go with a grill loop which is designed to protect your radiator and grill in the event of a rollover, much like what Patman explained.
Hope that helps. End of my first post - carry on then LOL.