CDN module vs CloudFlare module

Hello everybody,

I want to use CloudFlare CDN.

As I see there are two ways to achieve it:

1) Configure CloudFlare CDN solely.
2) Use it through CDN module.

or

1) Configure and Use CloudFlare CDN through CloudFlare module

Are both approaches correct? If yes, what does it offer each one? If not, why not?

Thank you.