Saucony Endorphin Speed 2 Runshield vs Nike Zoom Fly 3

The Saucony Endorphin Speed 2 Runshield hasn't managed to perform well enough to earn a place in any Running Shoes roundups conducted by sources that do their own, high-quality, hands-on testing. That alone makes it a hard product to recommend.

As for the Nike Zoom Fly 3 Women's - it impressed reviewers at Gear Patrol, a trustworthy source that conducts solid hands-on testing. It did great in its "Science Says Carbon Fiber Shoes Mean Faster Times, but Can They Work for You?" roundup - in fact, it earned its "Best Speed Trainer for Competitive Runners" title, which, on its own, indicates a certain level of quality.