which color space has most accurate color difference calculation?

Among various color spaces like L*a*b, RGB, LCH etc. which has most accurate results while doing the color difference calculations. In L*a*b color space among various color difference formula for delta E calculations like 'CIE94', 'CIE76', 'CMCl:c', 'RGB', or 'CIEDE2000'which one of them is most accurate for L*a*b color space.