Looking for opinions on what tip has the most grip.
Tips do not grip, it is the chalk provides the grip.
I am looking for a tip that holds chalk well and does not quickly glaze over.
Hard tips (not preferred around here) glaze less, but require a more deliberate stroke.
Glazing is caused by the tip slipping--the tip slipping is caused by indeliberateness of the stroke and lack of chalk on the tip.
My tips generally require maintenance about twice a year with 10 hours of play time per week.