I don't think I posted they are better. They are harder.
But the reason is you can't get light lube, non contact steel bearings on standard bike parts. But you can in ceramic.

So, stock ceramic sets... Are lighter and lower friction (because of the other start in part).
Ceramic Speed is just a pricey brand having little to do with the material.

I get cheap ceramic for performance bikes and replace when needed. For BB, hubs, not headset, not pedals yet, but I plan to. The headset just for weight weenie reasons. The trick is knowing the size/fit. Then they are similar to steel, you have to get them put in. They don't compress much, neither do steel, but most metal receptacles expand to take the press fit.

I replaced one wheel bearing this year that got messed up in the rain, or hose. ~$30. Last year replaced bb bearings ~$70