Please remember that any mention of competitors, hinting at competitors or offering to provide details of competitors will result in an account suspension. The full rules can be found under the 'Terms and Rules' link in the bottom right corner of your screen. Just don't mention competitors in any way, shape or form and you'll be OK.
I never really understood the benefits of that argument. Sure, you can upgrade for the next 2 years through AM4 if you want, but it's a very small minority of people that actually upgrade their CPU every 2 years or less whilst keeping the same motherboard. The vast majority keep their entire system the same for way longer than 2 years.
Sigh. Try reading my post next time instead of repeating the same drivel. I said I'd go R5 1600(X) if she wasn't going to be streaming.above your girlfriend is wanting to stream.for solely games the intel option is better.
if its soley for gaming go with the new intel chips.they are faster.better.
the only reason to pick ryzen is budget or if you multitasking on a budget.which they are good for.
which still makes no sense.only ryzen to choose ryzen is if you multitasking and gaming over lower tier intel.if its just for gaming their is only one reason and its budget not performance.
the guy is mainly gaming get a intel.bf1 faster,witcher faster, pubg miles faster. all the big games people play in mp which is mainly todays gaming is better on intel.sometimes its close sometimes big differences.
so what if it ends up being £100 pound more for eg if you keep it 2 or 3 years ? you end up with a faster system for those 3 years for peanuts.even on budget builds.
the only reason to pick ryzen is budget or if you multitasking on a budget.which they are good for.
Having owned both, I can say he's right.
BF1 is a **** ton smoother, even a mid range 1070 on the 1700 would drop to 70% utilization in big fights causing noticeable slowdown and stutter.
No such thing on the 8700k my 1070 is locked at 99% (at completely stock with 2133 ram) its as smooth as I've ever experienced. With the frame times locked at 6-8ms, on ryzen these would spike into the 50ms at times.
Of course, you will dispute this. Set them side by side in bf1 and pubg and you will be able to tell the difference.

no point arguing on here tbh. people like me play games all day record all day and bench them all day. super sayen ryzen on bf1 check
https://www.techpowerup.com/reviews/Intel/Core_i7_8700K/12.html
so even top end ryzen is slower than a newer i5 for bf1.done.even i3s can beat them sometimes lol.
pubg
if you streaming games and play or recording and playing on same rig consider ryzen as a option if purely gaming no point just get a intel chip.bare truth.
I went from a 2500K to a 2700K and it cost me nothing.![]()
The best upgrade is a free one.

Actually I think I sold the i5 for more than I bought the i7 for...![]()
just watch out for those 50ms spikes 
+1. Still rocking 2500k with Asrock Z68. Bought them in 2011 I believe? I tend to upgrade my GPU more often, which sadly means I tend to run tech 'out of sync'. Good car with old CPU, then new good CPU with old GPU. I seriously have no need to update my system but the itch is starting... :/I never really understood the benefits of that argument. Sure, you can upgrade for the next 2 years through AM4 if you want, but it's a very small minority of people that actually upgrade their CPU every 2 years or less whilst keeping the same motherboard. The vast majority keep their entire system the same for way longer than 2 years.
To answer the OP's question, various early benchmarks indicate that performance of the i5-8400 is very similar to the i7 7700k and i5 8600k in most games. That's a £100+ saving for not much performance loss. The Ryzen 5 1600 is also a good option, but it doesn't perform so well in games.
Is your brother purely intending to game or?
I'm in a similar position to be fair, no real need to upgrade but the itch is getting 'itchier' lol - actually looking at shifting my 780 & picking up a used 980Ti to keep me happy for a while.+1. Still rocking 2500k with Asrock Z68. Bought them in 2011 I believe? I tend to upgrade my GPU more often, which sadly means I tend to run tech 'out of sync'. Good car with old CPU, then new good CPU with old GPU. I seriously have no need to update my system but the itch is starting... :/