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Harder would be better, ie throw better sparks from a firesteel. It's more about the type of edge than material, as long as it is hard enough.
For a striker for a ferrocerium rod, the harder, the better, and the sharper, the better. The material doesn't matter. It doesn't even need to be steel, at all.
If you have held a Fallkniven knife you know what I mean. They are really sharp.
Think ice skates.
Your Camillus might be like a newly sharped ice skate and your stainless knife might are like dull skates.
A Mora 2000 is a good knife but the blade back is not treated at all. It makes almost no sparks new from the shop. If you polish the back and you will get some great sparks.
If you have held a Fallkniven knife you know what I mean. They are really sharp.
Glass works great, but can be dangerous to use. I generally use a small piece of hacksaw blade, that works well also.