Out of these, the 5 o'clock shadow or light beard. I like scruff, but not when it grows out.
Light beard or neck beard
But it surely depends on the person itself. There are certain types of men who can look incredibly sexy with a full on beard and others don't. It depends if you are able to grow a full beard or not. If you're not, then don't try. There is no shame in having gaps in your beard. It's natural and only about 60% of the male gender can grow a full beard.
In my experience it's 7. To my surprise. Has to be a bit unruly, but not too long. I've said this repeatedly on GAG but the closer my appearance has come to Neanderthal (within reason--no bear skins, but yes to long hair and a natural beard), the more very direct romantic attention I've gotten from females, especially straight-laced and professional ones.
The exotic ones are a bit of a mystery to me. Never seen one on a guy who had a girlfriend, I can say that.