Interesting point: if the player's score is lower than the character's score, asking for a specific approach borders on unfair. While I wouldn't accept "I'm rolling Survival to find out more about the tracks," I would accept "I look at the tracks to get more information."
I was thinking that it's clearly an Intelligence check to use tracking training to learn about tracks, and then I saw the discussion about what actions are involved. So I'm picturing two characters looking at the same tracks:
The Genius gathers all the data he can about the tracks, with actions, before making an educated guess - Intelligence.
The Wise Woman uses some folk tales to guess what local creatures meet the general appearance of the tracks, more glancing around than acting, and probably notices something not available through induction, due to sheer - Wisdom.