This is strongly dependent on your Odyssey golf clubs speed and in some cases the brand of the shaft. If you have a swing speed of 85 Mph or more you generally should have a stiff shaft and if you have less than 85 Mph you should go for regular shaft. This can vary from shaft maker as some makers do have harder stiff shafts then other maker's stiff shaft and same goes for regular shaft Odyssey discount. If you have a previous shaft that you preferred you should take similar characteristics of the new shaft. Some custom fitter might tell you about torque tip and kick point of the shaft. Those terms are related to how the shaft behaves when hitting the ball Titleist golf clubs.