The short version
Both are premium mouth tapes. Hostage Tape is the viral biohacker brand with beard-friendly engineering. Somnifix is the FDA-registered original.
When is Hostage Tape the right pick?
If you have a beard or want subscription convenience and beard-friendly acrylic adhesive — Hostage Tape is the right shape at lower annual cost.
When is Somnifix the right pick?
If you want an FDA-registered porous design (FDA-registered (a listing, not clearance or approval)) with a multi-year track record — Somnifix is the right shape. If sleep apnea is possible, see a doctor first.