My answer is in two parts. Firstly I doubt there’s much difference between one brand to another. Much of what’s accessible to consumers is sold through middlemen, and we really don’t know where it’s sourced or made.
That said, I have an aversion to chynese product, and I bought from one of the sources listed above (can’t recall now which) because they advertised a “made in USA” product. According to my research at that time there was a plant in the southern US making track. So I ordered; and you guessed it, it arrived with “made in chyna” stickers all over it. I contacted them, they stated it was mistake because they ran out of US inventory and shipped foreign to complete the order. They offered a partial refund which I accepted since they claimed no domestic product was readily available. I have no way of knowing if they ever really had domestic inventory or if the whole thing was intended to mislead buyers.
Now that I’m done rambling, I focused particularly on getting hot dipped galvanized track. It’s also available in paint, powder, and electro galvanized. Long term HDG will be the best for corrosion resistance.