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A bit cryptic, but I assume you ask about mouthpieces.

I have, and use,

Kelly mouthpieces, which are Lexan

silver plated brass mouthpieces

one Yamaha signature, which is gold over silver plated on brass

one stainless steel mouthpiece, two more coming soon

The surface of the mouthpiece is much less important than the dimensions of the given design. I exclusively choose mouthpieces from the sonic results they allow me to produce.

I don’t like bare brass mouthpieces, and I don’t like the Denis Wick gold plating, because it wears off so soon, but then I have bought silver plated replacements for the Denis Wick mouthpieces I need for my tenor instruments.

Klaus

I never thought of it as a "jump," just a new material and style to try out. To agree with what I think Klaus is getting at, if I had two identical mouthpieces, save for the material, I'm not sure which one I'd pick. I do like how "clean" the stainless steel is, and how quickly it warms up to my face.

I've never really cared for gold plating though. Too slippery.

I completely agree with the previous posters. If someone who is making SS mouthpieces makes a size and shape that's perfect for you, that's more significant than what it's made out of. That said, the SS is nice. Particularly cool is because the material is so hard the critical end of the shank can be really sharp for reducing the airflow turbulence out of that into the leadpipe.