I was thinking about the SFA which has a 19" handle. For one handed splitting, I think head weight is more a consideration than handle length. The SFA has a 1.5 lb head. Both axes in your original post have 2 lb heads. Personally, I think I would want the lighter head.
Keep in mind that to me splitting kindling means taking small pieces and turning them into very small pieces. If to you splitting kindling means taking a log cut and turning them into smaller pieces then a larger axe is needed.
I would use a wood splitter to take log sizes to roughly arm size and then the SFA might be a little handier than a full size axe for one handed kindling making.
