"The Ghost is considered a neutral shoe, while the Adrenaline is a stability shoe," explains Hotchkiss. The Adrenaline GTS 22 features Brooks' GuideRails technology for added stability, and it's a little heavier. "The Ghost is likely better for day-to-day activity and casual training, while the Adrenaline is more geared toward the avid runner/athlete," says Hotchkiss.