From Toys to Satellites: The Timing-Device Application Pyramid (XO / TCXO / VCXO / OCXO & SAW)
TL;DR — Map your product to the right layer first, then pick the device by the metric that dominates that layer (power, stability, jitter, temp, or ruggedness). For the deep-dive, see Timing-Device Application Pyramid — Full Guide.
Why a “pyramid”?...