I have never used Fedora, but Debian is very stable, or at least as long as you don’t need to use proprietary Nvidia drivers, since I have occasional desktop freezes with them on KDE Desktop (on Wayland).
Anyway, if you are new to Linux I’d recommend to use Linux Mint instead of Debian, since it’s much easier to install and use, and it is already built on top of solid base of Ubuntu which itself is Debian-based. It theoretically is not as stable, but realistically you shouldn’t come to any issues.
You know what gives me stress? Websites that reinvent scrolling.