Gaming pc recommendation?

My uncle wants to buy gaming PC for his son (ready PC). It should cost a maximum of 600 to 700 euro.
My cousin wants to play Fortnite, new games, etc.

Would you recommend these?

https://www.one.de/one-gaming-pc-advanced-an01-frei-anpassen-bestellen-amd-nvidia

Or

https://www.saturn.de/...ppshare%7C

You are welcome to recommend other PCs

https://geizhals.de/...WL-1618294

Do they assemble? And is this site safe?

oh this page is comparison page

The site is only looking for the best prices ^^

Do it yourself! It's easy…

You shouldn't buy a pc in both shops

Here it is better https://www.dubaro.de/GAMING-PC/Gamer-PC-Ryzen-5-1600-mit-GTX1650Super::3321.html

There you get really good Pcs on a trustworthy site One.de is totally bad and Saturn is close

https://gpu.userbenchmark.com/...4056vs4039

about 50% difference in performance