If you're planning to use Windows, Nvidia is probably the better choice because of the RTX and DLSS features.

If you ~~are based~~ want Linux, AMD is the winner because the Nvidia driver has issues, some of its features don't work, and Wayland compatibility is spotty.

AMD also has FreeSync, and (in my experience) it has much wider support compared to its GSync competitor.

Hogwarts Legacy does support DLSS FG (Frame generation).

In general it's always better to wait, especially with the new cards around the corner (and corresponding price cuts).

You left out your resolution, do you play at 1080p? 1440p? 4K? What refresh rate? The decision largely hinges on that, for example for the games you listed at 1440p and 144hz+ even a 4070 is on the weaker side.

I'm an AMD fan, but don't think the 7800 is in a good price:performance ratio position. A 4070 I think is going to be the better option, especially considering Nvidia's frame generation tech hits a bit harder.

I'd wait for the super though. If you get that, it will last you easily as long as your 1070ti has. Unfortunately I think the price will be more than €600

One thing to consider: Nvidia has the better drivers and software on Windows by a long shot. Unless you want to game on Linux, then go AMD.

In terms of value per frame, AMD last gen is currently better