Deciding between regular and stiff shaft

How old are you?
I am asking, because if you are on the border and an older fellow, going with regular may be the better bet as your swing speed may slow down.

Also, stiff and regular aren’t the only options. Different shafts will have different results. I am a high ball hitter; the project X has made a huge difference for me.

I called Graphite Design and talked to their fitting expert. I gave him my numbers and I was also suppose to be an X flex going strictly on swing speed but he suggested their stiffest tipped shaft in a stiff. He told me it’s not about how hard you swing on the 2nd or 3rd hole but what you want the shaft to feel like late in the round when you need to hit a fairway. We settled on Tour AD GP6s. I absolutely love it. Only had one bad drive with it today.

I was looking at the Titleist AP1's and my swing speed was just at the lower end for stiff shaft. Best option for me at my age is the Regular+ shafts that fall in between reg and stiff. At 57 my swing speed will only go down over time not up.