it depends on your definition of popularity!
for example Tether is already very popular if you believe the daily trading volume of it and define popularity by how much people are using it. or for example Libra is something that has a big name (Facebook) behind it and it automatically is being advertised and is ahead in popularity.

but it is important to know that you can not compare things that are not in the same category! for example all these centralized coins should be compared with banks, paypal,... not with bitcoin.