Why use metal cake pan instead of silicone one?
Dark metal pans provide superior browning for breads, muffins, and the like that are better with a crust on them. In my personal experience, foods do NOT release well and they are NOT convenient to clean. I actually have thrown out my silicone muffin and loaf "pans" because of their abysmal results. I've never baked a cake in silicone, though.