So, when Dansko first produced clogs in Europe, they used the factory that is now Sanita. Dansko eventually moved production to China; the former facility created their own brand. So if you are a long-time Dansko fan, you should probably buy Sanitas, as they're what you *used to* buy.
That said, these last forever and they're super comfortable. I'm a teacher who stands all day. They're the best. I'm between sizes, and I always go with the bigger size for clogs.