"That universal agreement has fixed on 70 centimetres as the proper size for wheels does not in any way prove that this diameter is best; it simply proves that cyclists follow each other like sheep.... Make no mistake, uniformity is leading us directly towards boredom and towards routine, whilst diversity, even though it distracts us, holds our attention, our interest and the spirit of enquiry always on the watch. To change is not always to perfect, and I know that better than any others newly come to cyclo-technology. But to stand still, to sink into a rut, that is the worst of things for industries and for men."
So are small wheels better? For the type of riding I do, I would say yes most times. They may surprise you.