Low rank monkey here. This is for top 20 phd candidates:
How close are you with your advisor? How much time does he/she spend with you per week? How much of that is talking strictly work? How often does he/she give feedback and critique your work? How often does he/she offer alternatives or ideas etc?
Are you comfortable asking questions often (even small ones?) or do you ask things only when you are really stuck and clueless?