My last experience between the two was on early B bodies: The ACC fir better but the heel pad lacked the definition in the raised areas that the car's original heel pad had, but it fit well including the 4-speed hump. The Trim Parts carpet for the next car had a more accurate heel pad, but the fit was pretty poor around its 4-speed hump. Wonder how all that may have changed if they're both the same outfit.
Bottom line, I'd gamble on ACC before Trim Parts.