To add to what Lemurion wrote: I also read all three, and have for a long, long time. For what it's worth, Asimov's seems to have published the preponderance of Hugo winners over the last thirty years or so. I should also point out, by the way, that Fictionwise has almost all of the Hugo-nominated shorts and novelettes available for free.
Another e-magazine that has recently shown up on the Fictionwise list is the small, but excellent
Aeon Speculative Fiction.