Good morning or evening, dear community,
I have a struggle with how to better approach a comparison of two non-linear graphs based on logistic model. The first logistic model has ordinary X variable, while the second has logged X variable (I have used log(X.var + 1) as log(0) is not defined).
I would really appreciate if you would help me to answer questions I have for my research process:
How would you describe non-linear relationship in the first graph and the second graph, without relying of statistical output?

Kind regards,
John G.