Right. I think that is more informative than just that you find the 9's to be plenty for a 3-dive day.
I suspect if you did 3 shore dives in FL, instead, the 9's would not be close to enough capacity. They might not even be enough for 2 dives, if you were scootering along a reef in the 40 - 60 foot range.
Personally, I am glad I bought the 12s. Have not regretted them. Have never run them dry in a day, so have only bought the 1 pair of batteries, in the year and half we have had the BlackTips.
True - the nature of the dive makes a huge difference, especially with something like shore diving where you're on the trigger for a long time, should have been more clear about that.
I am curious too how the other brand of 12s compare, but based on my experience with the other brand of 9s versus the DeWalts. My next set though will most almost certainly be DeWalt, just for the weighting reasons, I like having it set and not having to mess with it. This conversation about my normal use of the scooter versus other types of dives with the scooter has me now somewhat leaning towards the 12 Ah just so I have the juice if I need it.