Amy,
Ghost Standard Tools 3.1 boot disc would replace your Ghost 2.5 boot disc. Ghost 2.5 does not have the ability to use the new Winpe versions, which means newer hardware seen in machines will be missing drivers during the boot process.
While linuxPE can be efficient, you will see issues with linux not having the correct drivers (especially for network cards) as new machines and hardware are purchased. I would recommend creating a boot disc with Ghost Standard Tools 3.1 and using Winpe10.
You are free to use Ghost 2.5 as long as you would like, but eventually it will be useless as hardware continues to progress.