First... http://www.pcgamer.com/intel-i5-8400-review-the-best-new-gaming-cpu-in-years/
I thought when i linked this you will take a look at it. Apparently you didnt. Scroll down a bit and check the fps difference.
Second... And for gaming specifically, the boost clock the 8400 boasts, blows away the 1600 out of the way.
Apparently the difference is much more than liquidated.
Now, i am not taking away anything from 1600 as its a pretty awesome gaming second and multitasking/workstation first chip, but, and there is a big but mind you, when it comes to gaming first, Ryzen cant make the cut as Intel still rules.
Right now, its couple of fps apart, but down the line, Ryzen will show age. Your call mate.