IPhone 7+ or gaming pc upgrade?

Which one should I upgrade? From iPhone 5s or gaming pc upgrade?

Added (1). I have got a GTX 1060 6gb, 8 DDR3 ram and an FX 8320e.

For the phone, I have an iPhone 5S, in a perfect condition and nothing broken.

So should I upgrade the CPU to one of the newest Ryzen (this includes a motherboard upgrade and I'll also upgrade my ram to 16 DDR4) or iPhone 7+?

The problem for the phone is its size and the risk of it not being very useful in the upcoming year, as it won't receive any updates. So I'm wondering, which one should I really go for?

Gaming PC definitely

Gaming pc upgrade all the way!