Hi Mate
I got a 2015 14ft x 25 inch allstar as my first SUP 6 months ago. I weigh 71kg's, 178cm tall, 40ish. I was told by experts that the 25 inch was as stable as the 26 inch wide version from the year before due to design improvements. No doubt similar advancements with the 2016 version over my 2015 version. I found it tricky to balance in choppy water to begin with, but that was due to me having no paddling experience (I opted for trickier to begin with vs having to get another board too soon). I practiced a lot in choppy water and can now balance it quite well, and have caught quite a few runners and small waves on it. Have used it in the lake for time trials, but mainly in the ocean. It glides nicely on flat water.
Will let you draw your own conclusions on balance from that
cheers