Statistics
For what it's worth, the magazines with the highest proportion of good stories (relative to their published volume) were Tor.com, Abyss & Apex, and Clarkesworld. That holds true whether we look at the main Metazine, Expanded Metazine, or both together. Given that Abyss and Apex and Subterranean Press are quarterly, their standing may change with more data. Still, while Tor.com publishes mostly excerpts, when they do publish stand-alone prose, it's excellent. If you feel you only have time for one magazine a month, read Tor (or of course our own Metazine).