If you are trying to select an airfoil for a particular application Profili or X-foil will give you consistent comparisons that may not be perfecty accurate but the inaccuracies tend to cancel out making it an excelent tool for comparisons.
I think that's a really key point, as many would-be Profili / XFoil users might discount the utility of such a tool, based on the numeric values being off by X%.
It's the
shape of the generated curves that reflects whether the relevant physical principles are addressed and, to that end, whether the program algorithms are correct or sufficiently deep. The obvious exhibit here is the smoothly continuous profile of the DesignFoil low-Re MH32 polars posted above, indicating a lack of Profili / XFoil's sophistication in this flow regime.
For comparative purposes, the fact that the curves may be shifted in some direction away from the real values is entirely inconsequential.