Here’s more information about the various iPhones that have TrueDepth sensors: Which is the best iPhone model for use with MetaHuman Animator? – Radical Variance.
TLDR; yes, if you’re doing facial mocap that leverages iPhone X through 16’s TrueDepth camera, 12 is definitely the way to go. Mini will save your neck. A good counterweight system will benefit any of the heavier phones. Also preferred by a lot of iPhone 12 mini users.