Covid prevented cricket for much of the year, though some T20Is were played. Here we have a summary of all T20Is in the calendar year 2020.

A total of 36 teams played T20Is during 2020. But would a table like this have much meaning? Many of the teams listed here have cricketing standards much lower than the “regular” teams who have been playing Tests and ODIs over the decades. (And the vast majority of the players in these teams are those who grew up elsewhere, mainly from South Asia with a few from England and Australia).
The Playfair Cricket Annual recognizes the distortion which the “big bang” has caused, and have listed records “only for matches where at least one of the teams has played ODIs at some time.”
I am going a step further and am listing records only for matches between teams which have played ODIs.
There are 24 such teams after you remove the ICC World XI, Asia XI, Africa XI and the vanished East Africa. We then find that only 14 of them managed to play T20Is during this period.
We then repeat the above table for these 14 teams:

This seems to show that India is the best-performing team here, ahead of England and Pakistan.
Next I will take up individual performances in matches between these 14 teams in 2020.
https://abn397.wordpress.com/2021/01/09/t20is-in-2020-part-2-individuals/