Depends on your face.
If you have a weak jaw, then grow a beard. You will look much better. I'd recommend keeping it shorter/trimmed, but you could try growing it longer to see how it looks. Careful with that though, many long-bearded guys look like tryhard neckbeards. A long beard only goes with very certain styles.
If you have a strong jaw, then maybe. You might look better with a beard, but even if you do it won't be by much. With a strong jaw, I'd recommend keeping it trimmed at just past stubble length.
Check out this article on a study on this subject. Probably worth reading the study itself as well.
http://www.huffingtonpost.com/2014/04/16/beard-study-hipsters-facial-hair_n_5160616.html