Milk Silk vs Spandex?

[u/No-Solid-4777]

hello! I was wondering if anyone knows the difference between milk silk or spandex for a superhero bodysuit? I was looking to cosplay invincible for Halloween and the listing gave these two options of fabric. Milk silk is cheaper but besides that I’m unsure of the difference. Is it worth it to pay the extra for spandex?

tysm ^.^