What SaaS is using these days for Microsoft IdP? Are they still using ADFS? Entra ID? Are both supported?

I'm a bit lost in advantages and disadvantages of each. Of course I know ADFS is on prem and Entra ID is cloud but what is the selling point of each other than the tradeoffs between cloud regulation and on prem infrastructure? How is the support for both been evolving on SaaS? submitted by /u