Shoe shopping for outdoor activity gets complicated fast once you account for terrain, distance, and personal foot shape - but a few practical checks cut through most of the noise that marketing adds to the decision.
A shoe optimized for pavement and one optimized for uneven trail terrain solve different problems - cushioning and flexibility for the former, stability and tread for the latter. Buying based on where most of your walking or running actually happens matters more than buying the most highly rated shoe overall.
Cushioning breaks down with mileage even if a shoe still looks fine externally. Tracking rough distance covered is a better replacement signal than simply how long ago the shoes were purchased.