Approx. 18mths ago I moved from KeyCDN to
BunnyCDN, for better pricing and improved POPs in my target region. Very happy with the change, and I now recommend BunnyCDN over KeyCDN.
For the purposes of the guide though, it doesn;t matter which CDN you use as the steps are reasonably generic for any CDN provider, and it's more about the speed and bandwidth improvement outcome than the actual provider used in the steps.
