You can check your world but, if it's "normal", your pitchers will face 63-65% RH batters. Therefore, IMO, VR is almost twice as important as VL. Both are more important that GB/FB. GB/FB only seems to be a real problem at the extreme low end. Hitting stats work together so pinpointing one as "most important" is difficult. Set acceptable minimums in contact, power, splits, eye and work off that.
As tec said, work toward a higher number in college/HS scouting. If you're going to spend 20m combined, 20/0 or even 18/2 is much better than 8/12.
Finally, your ADV does not matter with HS/College players. The projections you see come from your HS/College scouting budget.