Assuming spring material, diameter of the material of the spring, diameter of the spring itself, and length of the spring are all the same......one with less coils will be stiffer. That is just the nature of springs. A spring with less coils has less material, therefore is less conducive to flex. The same way it's easy to bend a 10ft pole, but hard as hell to bend a 1ft pole.
But if one spring is shorter, more narrow, different material, different diameter.....etc. You can throw that out the window because you are comparing apples to oranges. So it really isn't a reliable way of comparing two different springs of unknown make.
