It's totally upto you bro. It depends on how you use your phone. If you feel you might break it, then it's better to put a screen guard, so that you get inner peace & you can use you phone without worrying.
I personally don't like to use any screen guard as it makes the phone look bad. My phone has a regular glass and I am using it without any screen guard. It is still perfectly fine even after 1.5 Years.