PageCheck offers Free Trial, but GTmetrix does not.
PageCheck is designed for Medium Business and Small Business.
GTmetrix is designed for Large Enterprises, Medium Business and Small Business.
Pricing for PageCheck Starts at $19/Month whereas for GTmetrix Starts at $10/Month when Billed Yearly.
Some top alternatives to PageCheck includes Uptime, Super Monitoring, GTmetrix, Uptrends, 66uptime, WebForce Uptime, Pingt.io, 4Uptime and Performance90.
Some top alternatives to GTmetrix includes PageCheck, PageSpeed Green, Wattspeed, SolarWinds Pingdom, Epic Ping, Page Health, PageWatch, Speedrank and PageSpeed Plus.