I think dogfancy is totally overpriced. I subscribed last year because of their $13 offer, but IMO at $27 it is a rip off. There are just way too many ads, and the articles are lacking in depth. You really won't learn anything compared to this forum. That, plus I find their section about pampering dogs unacceptable, and they are too focussed on pleasing everyone to give accurate information about food, breeders or breeds.
For dogworld, I don't know it.