I have to say Daily Prophet. After all, it is the major wizarding newspaper in England and "it's good to keep up with what's going on in the wizarding world" (Prisoner of Azkaban, Chapter One - Owl Post), even if the source of information can be often biased. But isn't it the case with newspapers and other news sources in general, whether it comes from muggle or wizarding world? It did print true stuff when it wasn't under pressure from the Ministry of Magic to keep things quiet and, thankfully, Rita Skeeter is not the only correspondent working there. Ginny Potter worked there as a Quidditch Correspondent and I greatly enjoyed following her reports on Quidditch World Cup that took place this summer in Patagonian desert - just check out Pottermore - it was great. So, on the whole, I believe I would enjoy getting and reading it. I can't find the quote but I think it was Dumbledore who said something along the lines that Daily Prophet is bound to get something right once in a while. Besides, I just can't imagine taking Quibbler seriously and as much as I love Luna I'm so not into Crumple-Horned Snorkacks. However, I would consider it as an alternative source of information (that it actually became for a while) if Daily Prophet continued to print false reports and turn a blind eye on something as important and life-threatening as the return of You-Know-Who.