Chemical Structure
They differ by the position of a double bond, creating significant differences in potency.
Effects
Delta-9: Stronger psychoactive effects, intense euphoria.
Delta-8: Milder, clearer high with less anxiety.
Legal Status
Delta-8 from hemp is federally legal under the 2018 Farm Bill. Delta-9 above 0.3% varies by state.
Which to Choose?
Mild experience: Delta-8. Full strength: Delta-9 where legal.