Delta-9 THC is generally considered to be stronger in its psychoactive effects compared to Delta-8. Delta-8 THC is a minor cannabinoid that is chemically similar to delta-9 THC but has a slightly different molecular structure. Delta-8 is known to have a more subtle and less potent psychoactive effect compared to Delta-9 THC, although individual experiences may vary. It's important to note that the strength and effects of delta-8 and Delta-9 THC can depend on various factors, including dosage, tolerance, and individual sensitivity to cannabinoids.