When I'm interviewing, I like to see someone fairly smart if that's what the job requires, but lots of people wear stubble and that doesn't matter at all.
I think when you ask this question you're focussing on the wrong thing really - you're not going to get a job because of the way you shave. You'll get it if you're honest, they think you can hack it and there ain't no-one they like better. Simple as.
Problem is, as much as there are people (like yourself) who have the right attitude to it all and concentrate on what exactly is required for the job - there will be other people out there who will not be as impressed whatever answer you give.
It all depends on the job and the interviewer but for the sake of a bit of stubble that I could grow back within a day or 2, I wouldn't take my chances to see what kind of interviewer I got if it's the job I really wanted. Take away any ammunition for them not to give you the job based on first impressions and you're halfway there.