To be fair, I didn't just compare them, I suggested that Miller has the potential to be a better version of Harvin given that he did play QB for three years.
Clearly, I'm biased, but at the same time, that means that I got to see Miller's running ability as a QB and think that it would translate exceedingly well to other positions. That having been said, I didn't see all (or even as many as a Volunteers fan would) of Harvin's games, so you might very well be right.
I just hope that we get to see on the field who has the better perspective.