Biggest Area for Judging Hitting Prospects?

[Trov]

I will be honest, I have not done the research or anything, but I think for hitting prospects, the biggest area I look at is their K rate, and K to BB ratio to help determine their ability to hit at higher levels.  Yes, there are other areas, but without watching, if you want to just get a good overview I feel that is a big area to look at.  Why is that? Specifically, it helps show at the lower level if they are chasing pitches, and if they are able to find good pitches to hit.  For example, if you have a low K rate, then you at minimum are making contact.  This does not mean it is always good contact, but no much swing and miss in at bats.  Maybe they attack pitchers early though.  If the K to BB ratio is good, then that generally means they do not chase much, and can stay off pitches they do not like.  If both are combined that can be a good combo.  

Of course like any stat they need to be taken in combo with others, but I feel it tells more of a story than just something like HR. Is there an area you think tells a better story at first glance? I would never judge a guy just on one stat, but some I feel tell more about them than others.