That's entirely dependent on your facial features, hairstyle, clothing choices, and so forth
But generally...
A proper facial hair style should be not patchy but thick (never grow out your facial hair in any patchy or sparse areas if you have them, is what I'm trying to say), and on the shorter side. Those long chin beard things for example that some metal fans decide to sport, look very poor. Also NECKBEARDS NEVER.
A moustache can add a lot of character, but for most people it will just make you look like you're trying too hard, time walked from the 70s, or like a molester.