But I dont think you gain roll stability with the long ones, honestly.
The thing is, those riding these, when comparing, will most likely ride at the same height above the water with the 2 longer masts, as the shorter one, when comparing same day (it is a natural thing we all will do I think).
Meaning it can not be compared, as you will have more mast in the water this way - whereas when you are used to riding only one mast, you will only have about the same (small) amount of mast down in the water, thus the roll resistance will not be higher with the longer mast
But there are so many factors into this, like you can not turn back and fourth in as tight arcs of course, and this might lead you to think it is roll resistance that is higher, which it is not.
Good to compare, but I would be a bit sceptical with some of it
Pitch stability will be worse with the short ones it seems, much more sensitive ? Makes sense yes.
Which is not what beginners want - but on the other hand, they wont crash as easy as the board can recover easier, and the delay is not evident either, a good thing.
I got an 83 and a 100 cm mast, but can not compare as never used in the same conditions, and WHEN they are (because the wind picks up t.ex), I still tend to ride my 100 cm too deep, just after changing mast - so not a valid comparision in this respect unfortunately.
Loving the comparisons though Pedro, interesting, and lets hear from others too with experience on this very thing