I was happy with Dawkins book until being told, by a geneticist if I remember right, that he wasn't very serious, that Gould was serious reading but Dawkins was not completely so. I'd be glad to know if it's right or not.
John Maynard Smith, possibly the preeminent evolutionary theorist of our era:
"Gould occupies a rather curious position, particularly on his side of the Atlantic. Because of the excellence of his essays, he has come to be seen by non-biologists as the preeminent evolutionary theorist. In contrast, the evolutionary biologists with whom I have discussed his work tend to see him as a man whose ideas are so confused as to be hardly worth bothering with, but as one who should not be publicly criticized because he is at least on our side against the creationists. All this would not matter, were it not that he is giving non-biologists a largely false picture of the state of evolutionary theory."
Also, I haven't read an essay that is quite so direct as this one that you link to. I'd point out that this link illustrates my point: When scientists get down to business and talk about each other's work, they do not mince words. It's kind of refreshing, actually.
The three guys I named have various disagreements on one thing or another, so it wouldn't surprise me to find that each has his partisans. Also note that science writing for the public is a completely different art than science, itself. Gould may well be taken more seriously as a practicing scientist, but that shouldn't necessarily matter to me as a reader of his popuLar works. Isaac Asimov was a great science writer, but his scientific career was brief and undistinguished.
As far as I know, Dawkins' books give his version of evolution, that is somewhat non-standard and not yet proven. Gould used to write about evolution more as it was widely accepted by scientists on his time. I know they both have disagreements, but as far as I know Dawkins is faster in writing about not very accepted subjects as widely accepted science.
As for your generalizations: I think they're way too sweeping. Gould and Dawkins have written hundreds of thousands of words. Some of those words are probably too daring, others not daring enough; some are words about cutting-edge subjects, some are about classic works in their fields. Some of their words have caught fire in the popular imagination to a much greater extend than their authors intended, i.e. Dawkins' "meme" concept was originally intended as a half-joking metaphor, and he himself doesn't take it too seriously.
But finding a meme these days is like mentioning the long tail. It seems a little antiquated and cutesy.