Lets talk Roller Cam Lifters.

Roller wheel material really only changes with higher spring pressures. Typically as the cam lobes get more aggressive the cam is machined from a billet instead of a cast core. More aggressive lobes plus the higher associated engine speeds require more spring load to control the valve train...which is how we get to the harder materials mentioned above to avoid grinding the wheel and cam into Oblivion.

You'd want to "match" materials so to speak, but price points usually take care off that. Most people probably wouldn't buy the cheap cam with the expensive lifters... unfortunately the opposite is usually true which is one thing that can contribute to lifter failure.