I like it when my guy goes from clean shaven to stubble. I don't like actual facial hair, but my guy doesn't need to shave everyday. He needs to shave at a minimum once a week. Usually more but I guess it depends on the guy too.
I dated one guy who went from clean shaven to stubble from morning to evening. It only took him two days to have about an inch of hair. Crazy. But yea, I prefer cycling from clean shaven to stubble.
I like whatever looks nice on a guy. Like my boyfriend, he rocks the gotee and the lines or whatever they are. A lot of guys just can't though, and OK that's fine, just shave then. Personally though, I like someone I'm dating to have something on their face, I'm not sure why, I just don't like when their shaved because when you have facial hair, it signifies your a man (I know not really, but like in Greece a long time ago that's how it was).