Catrin,

Judging by the size of the pic of the bike on your avatar, I am assuming you are small. If I am assuming correctly, you will much more likely have a better fit on the bike with smaller diameter (26") wheels.

700 x 32c equals a large wheel diameter, quite a bit larger than even a standard 700c road wheel. Chances are, the frame will be designed to compensate for that larger wheel diameter, therefore putting a longer top tube on the frame, likely than any road bike they would make in that same size. This translates into a longer reach for the rider, which usually isn't a great thing for smaller riders. It also means a high front end height, which can be rather limiting for a shorter rider.
Surly got smart and started putting 26 inch wheels ( a smaller diameter wheel) on their smaller frames, so they didn't have to increase the bike's reach to accommodate the larger wheel. Therefore, it probably has a shorter top tube, and, chances are, that will work much better from a fit perspective for a smaller rider. Chances are, also, the front end height isn't as high, and, imo, if the reach is correct, this equals a better fit for the small of stature.