What is the best page speed metric?

I'm building a tool that scans a website and outputs a SEO report.

And I want to include a "Page Speed" metric to the user as part of that analysis.

The API I am using has a variety of page speed metrics, but I'm not sure which one is the most appropriate.

Which would you use?

This is the list:

• time to interactive – the time it takes until the user can interact with a page
• dom complete – the time it takes until the page and all of its subresources are downloaded
• largest contentful paint – the time to render the largest content element visible in the viewport, from when the user requests the URL (core web vitals)
• first input delay – the time from when a user first interacts with your page to the time when the browser responds to that interaction (core web vitals)
• connection time – the time it takes until the connection with a server is established
• time to secure connection – the time it takes until the secure connection with a server is established
• request sent time – the time it takes until the request to a server is sent
• waiting time – time to first byte
• download time – time it takes for a browser to receive a response
• duration time – total time it takes until a browser receives a complete response from a server
• fetch start – the amount of time the browser needs to start downloading a page
• fetch end – the amount of time the browser needs to complete downloading a page