Should I take an i7 10700k with a 2070 Super or a Ryzen 7 3800X with a 2080 Super? Will play with it (Fortnite GTA Warzone) with at least 144FPs
Take the Ryzen and the 2080S, that gives you more FPS. You can save yourself the additional cost of the 3800X and take a 3700X.
In case of doubt, always the stronger GPU, unless it's too bad a CPU for the GPU - but that's not yours.
What resolution do you want to play in, what is your budget, do you already have a monitor?
You will achieve 144FPS with both combinations in these games (as long as it is not 4K).
I wouldn't take any of it at all, but a Ryzen 7 3700x with an RTX 2080 Super and then save some money!
At the moment I would choose a Ryzen 7 3700X, as the 3800X surcharge is not recommended. Then an RTX 2080 Super and you have decent performance in all games. Only 4K is not necessarily recommended, but that's your thing.
As long as it is not 4K
Get a short stroke while writing…
Can't correct it anymore. : /