Light or Max is a fabric decision, not just a thickness one
Most people assume the two are the same sock with more padding in one. They aren't. Feetures publishes the fiber content and it's genuinely different: the Light Cushion is 96% nylon with 4% spandex, and the Max Cushion is 73% polyester with 23% nylon and 4% spandex.
So the Max isn't just thicker, it feels different underfoot. If you're wearing these over an orthotic, the Light is usually the answer, because a thick sock eats the volume your insole needs. If your shoe has room and you're on hard floors all day, the Max is worth the bulk. Quick facts above says which this pair is.