FYI, chains don't actually "stretch", as in the links don't get any longer. The pins and the material around it wears away, and the cumulative effect makes your chain longer as it wears.

Oh, and I've used SRAM chains on all my MTB and roadbikes for years with no problems. Very quiet. I switched to a KMC once and it was fine too, but a little noisier. I also use White Lightning.