I would highly appreciate your thoughts

well this question is a follow up for a previous question but it seems that I could not found it.

Well, I am trying to vary the mesh size and record the maximum stress in order to determine the best mesh size.

The chart attached indicate the results, where the bar is missing it mean that I had an error.

My question according to this what is the best mesh to choose, my opinion is to calculate the mean value and to choose the nearest to ?

I would highly apreciate your thoughts.

Thanks in advance