Area10 said..
Well, any adult male with a halfway decent stroke. If you are a beginner you might be either the same speed on both or slower on the 14 in some conditions because of the increased frictional surface and greater technical demands in eg. cross-winds of a 14. As with every bit of kit, a 14 only makes you faster if you have the skill to benefit from it. I'd be faster round a race track in a VW Golf than a F1 car because I just haven't got the skills to handle a F1 car. And to a lesser extent this is analogous to what goes on with "performance" SUP kit. Beginners aren't fast on "fast" boards. They are faster on "slow" boards. Fast paddlers are fast on fast boards :)
Most average paddlers will find a speed increase of around 3-5% when moving from a 12-6 to a 14. It's almost insignificant if you are just casually cruising, but certainly is if you are racing over a decent distance.
Ok, I understood your points, Thanks.