What physical property method should be used?

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The parameters of a methanol distillation air cooler are as follows: operating pressure 0.05 MPaG, operating temperature 75°C. The composition (by weight) is as follows: H2 – 337 ppm, CO – 64 ppm, CO2 – 3.6%, CH4 – 540 ppm, N2 – 210 ppm, H2O – 11.4%, C2H6 – 109 ppm, CH3OH – 84.4%, C2H6O – 0.1%, C2H4O2 – 0.2%, Propane – 0.1%, C5H12 – 307 ppm, C6H14 – 237 ppm, C7H16 – 273 ppm. In my opinion, this is a low-pressure system containing polar substances such as water and alcohols; therefore, the UINFAC method should be used； However, it can be calculated using either the PSRK or LEE-KESLER-PLOCKER procedures; yet aside from the heat load value being twice as high in the LEE-KESLER-PLOCKER method, the values obtained for the other physical properties are similar. I’m not sure about this, so I’m seeking advice from experts! ! !