As MouseFink alludes to, the application is the determining factor. What exactly are you doing with them? Stockish hydraulic flat tappet? Flat solid? Hydraulic roller? Solid roller? Race? Daily driver?
Comp's selection of pushrods is second to none. The "High Energy" series are for relatively stock engines. They DO need to say "hardened" or "for use with guideplates" if you use them with guideplates. The "Magnum" series is adequate for most street applications, including rollers. They're ALL "hardened". We use them until seat pressure exceeds 180. The "HiTech" series are among the best pushrods available, as already stated. MASSIVE overkill for anything but a solid roller with lots of spring.