Argan. Argan wins for hair shine — its molecular structure forms a smooth cuticle film. Jojoba is better for scalp use (sebum balance) than for hair shine.
Argan treats the strand; jojoba treats the scalp. For smoothing, shine and split-end protection, argan is the pick. For scalp balance and as a carrier for growth blends, jojoba wins. Long-haired users often use jojoba on the scalp and argan on the lengths in the same session.