Which is better for sculpting ur mask base? Clay, or cardboard pieces?

I am a therian who awaken 2 months ago. And I want to make a mask, last one from a while ago was a total fail.

but, for sculpting details onto the ears and making lil glasses, would clay or cardboard be a better thing to use for it? i see cardboard more commonly used, I think clay would work better, but I want to know based off ur experiences