I think best registrar polls should be at the end of the year.
2016 poll was in march. Godaddy won, 52%. Thread by @JB Lions .
2017 poll was in november. Godaddy won 29.8%. Thread by @equity78
There was no poll in 2018.
2019 poll was in june. Namesilo won 24.4%.
2020 poll was in march. Epik won...