My own personal preference is for Iryna Zenyuk (aka Energia) ... although Natalia Pogonina has written some very nice stuff that I liked. But I've read many more articles by Zenyuk than Pogonina, and if this were a survey situation, my vote would go to Zenyuk.
The best article writer.
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Silman for me, he writes in a really engaging fashion.
Guess it depends on what you're looking for. I really appreciate batgirl for her historic perspective and I also like the analysis of her own games she posts. NimzoRoy has always excellent chess knowledge to dispense and seems to be a nice dude.
The professional article writers on this site keep all a certain standard.
Personally I like Serper.
Always I read again and again of him. The Typical Patterns series.I read again and again.I also like Silman and Natalia.