The main difference between THCa and THCO is the effects that are felt with each. THCA does not produce psychoactive effects, so it will never make you feel intoxicated or confused. When THCa is heated, the psychoactive effects on the substance develop. Therefore, the potency of THCa is essentially zero compared to the THC of Delta-8.THCA is the acid form of THC; when exposed to heat, it eliminates the acidic carboxyl group transforming THCA into pure THC.
Whereas Delta-8 is a milder form of THC.