Metal Trusses are not better or safer Than Wood Trusses when it comes to Fire Performance.  Being educated on the Fire Performance and How to Fire Rate Wood Trusses is the key.

The Carbeck Structural Components Institute’s (CSCI) Wood Truss Construction and Fire Performance education program provides firefighters with information needed to more safely fight fires in buildings constructed with wood trusses. Addressing the facts surrounding the performance of metal plate connected wood trusses when fire strikes, the program is comprised of more than 20 educational modules divided into short 5-10 minute segments. Modules cover topics including an introduction to wood trusses, fire performance of wood trusses and information for firefighters

Also See attached How To Get from 45 minute Rating to 2 Hour Fire Rating on Your Trusses

ttbFire- Fire Resistance Rated Truss Assemblies