I want to grow my own mustache.
For myself, it's always stubble. The last time I was clean shaven was 1st November 2011, for Movember. I also have sideburns if that counts. They're not huge though, they come up to just above my earlobe and I get those suckas trimmed back whenever I have my hair cut.
On who? On me or on others? I hate having any facial hair and my body supports this decision. I grow facial hair EXTREMELY slowly and it never fills out slowly. On other, it's a case-by-case basis. Some people are able to rock some looks really well and others look awful with it.
Since it's 2012, either clean shaven or a full beard -- stubble on off-days because we're only human.
Assholes, douchebags and date-rapists have ruined everything else -- goatees, chin-strap, soul-patch, etc. This isn't the 90's. Sideburns down to the earlobe or mutton chops are unattractive too, and kind of make you look like a creep, but I admire guys like Brad or Pope for their commitment to the burn. Nerds have this weird fascination with long sideburns, it's weird.