Well, there's no one right answer to this...if there were, there'd only be one kind of scout.
Guys who favor ability will look at the skills aspects of baseball...particular things that scouts look for. If they're fundamentally good at baseball, their "ability" will be favored by the scout over others.
Guys who favor tools will look at the natural, raw talent of players. Like, if a guy is bigger, faster, and stronger than other players, yet may not have produced much on the field, the scout who favors tools will want you to take a long, hard look at him and see if you can develop him further.
It all comes down to personal preference...what do you look for when you see a prospect? Fundamentals? Raw talent? Your game, your choice. Keep experimenting, you may find something that works for you.