Weekly or monthly?
A monthly sheet shows streaks. A weekly one forgives. If the first four days of a month go badly, a monthly sheet stares back with a gap at the start for the next four weeks, and plenty of people stop filling it in around then. On a weekly sheet, a bad Tuesday is gone by Monday.
So use weekly if you are starting something new or restarting after a break. Switch to a monthly grid once a habit holds, because that is when you want to see runs longer than seven days. Our monthly printable tracker is on this site too.