How to find most frequently used CDN version of any service

We generally use lots of CDNs on our websites for a faster load of desired resources. For each service, there are lots of CDN providers like Cloudflare, MaxCDN, etc and each service has lots of versions and sub-versions. So is there a way we can find which CDN for a specific service (like font-awesome) is mostly used over the internet?

I want to know this because according to my analysis when I use the CDN let's say for font-awesome which is used on maximum websites then there is a higher chance that when my site loads then we get already cached on the user's browser.

I understand that different websites use different versions of the same service according to their need. But can we get the most used CDN for font-awesome V4, font-awesome V5, and so on?

Note: I checked on google but from my side, I didn't find any website that keeps a track of these.