It's all down to personal taste. I've read both Gene Wolfe and Ray Bradbury, though I'm not really a sci-fi fan, fantasy and horror are my preference.
I've also read Lovecraft, are any these my favourites? do I consider any of them the greatest? No.
Sometimes I feel a lot of genre readers look down their noises at people who prefer the newer authors, yes the older works deserve their classic status but not everyone can relate to them, specially the younger generation. My 20 year old nephew couldn't finish At the Mountains of Madness, thought it was disgusting.