This is a good question. The word "best" in this question needs to be clarified, since the evaluation of open archives in mathematics depends on the criteria used to make the evaluation.
On RG, a start in answering this question can be found in
This is a good question. The word "best" in this question needs to be clarified, since the evaluation of open archives in mathematics depends on the criteria used to make the evaluation.
On RG, a start in answering this question can be found in