Is a foot pod or GPS more accurate for running distance?

Neither always — GPS is better in the open, a calibrated foot pod better under tree cover, in cities and on treadmills. Match the method to where you ran.

Distance: GPS watch vs phone vs foot pod — which is right

GPS and a foot pod do not measure distance in the same way, so the question is not which device is accurate but which method suits where you ran.

Two completely different measurements

A GPS watch derives distance from your position over time — satellite geometry, integrated along the track. A foot pod derives it from your stride: steps counted, multiplied by a calibrated stride length. A phone uses GPS like the watch but from a different antenna and chipset. These are not three attempts at one measurement; they are three methods, each precise where its assumptions hold and wrong where they break.

Where each one fails

GPS is strong in the open and weak under tree cover, in cities between tall buildings, and on tight switchbacks, where it cuts corners or zig-zags. A foot pod does not care about the sky but drifts when your stride changes — sprints, hills, fatigue — unless recalibrated, and it is the only one that works on a treadmill. So on an open road GPS wins; in a forest or a city or indoors, a well-calibrated foot pod can beat it.

Which to trust

Match the method to the environment: GPS for open outdoor running, a foot pod for trails, urban canyons and treadmills. When they disagree, the tie-breaker is where you were, not which brand you own — and consistency matters more than absolute truth, so pick one method per context and stay with it for comparable numbers.