It’s the same thing, it’s just that your certificate lives on Azure and when you sign, signtool sends the digest to azure to sign instead of to the token on your machine.
You need a business that has existed for 3 yrs, and you need to be based in the US/Canada/EU/UK - not available in Australia - it will probably be available eventually I haven’t found any info on it yet.
I’m not a fan - but it’s a better option that other cloud based signing services like ssl.com or certum - those services provide very few “signings” in their monthly fee.
Of course if you have your certificate on a token, you can sign as many files as you want, and it’s faster ( no cloud latency).