The way it worked for me was as follows.
I was struggling to get the club head square at impact as my hands were getting through the ball much before the club head, leaving the club face open.
If you are not sure, check out your local club for one of their fitting days where they can analyse your swing and match the right club to you

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Titleist 983k - fujikura stiff shaft
Taylor Made R7 Steel 15* - Re*ax stiff shaft
Mizuno MP32s - S300
Mizuno MP T Raw Haze 51*, 56*, 60*- S300
Scotty Cameron Red X - 330g