let's encrypt vs cloudflare or both? [closed]

I've been really confused between cloudflare's ssl and using let's encrypt to have my website become full https.

Many sources say to use either or use both.However there is not a very decisive way to figure out whether to use both or just use one over the other.

In most cases, people love cloudflare because it is a free CDN. And it comes with a simple way of setting up SSL

However it looks like Let's Encrypt is the next big thing and it would be silly not to learn more about it.

Some people say that Cloudflare is enough..http://community.rtcamp.com/t/letsencrypt-with-cloudflare/5659

Some have gone to extreme lengths to set up bothhttps://medium.com/@benjamincaldwell/better-ssl-tls-certificates-from-lets-encrypt-with-nginx-and-cloudflare-9f01f89940cd#.tlhx6g5in

https://community.letsencrypt.org/t/how-to-get-a-lets-encrypt-certificate-while-using-cloudflare/6338?u=pfg

http://pushincome.com/cloudflare-lets-encrypt-free-ssl-setup-ubuntu-apache/

https://flurdy.com/docs/letsencrypt/nginx.html

I was wondering what was the best way to setup let's encrypt properly to use with cloudflare still as a CDN for my content.

Thanks.