Forum Post: Spectre X vs APS++

I look at the following and it seems spectre X Mx accuracy is close to Spectre APS Moderate (not sure if APS++ has the same %accuracy). When I simulate my post layout differential amplifier, former gives 6mV DC offset, latter gives 0.5mV DC offset, DC analysis. My question is, which one is more accurate, and I can trust more? P.S. Spectre Cx also gives the same offset as Mx and I do APS++ with liberal accuracy, with conservative I also get 0.5mV offset!