Cloudflare analytics is correct or not?

I am using Cloudflare and google analytics on my website but the number of unique visitors shows by Cloudflare is 400% more than google analytics. please help me to analyze my website data of unique visitors. please tell me which one is better and correct.

in this image, my unique visitors for the last 1 week are 15,000. But in google analytics it approx 4,000. what's going wrong.