If you need stability, I definetly recommend you going with Debian. I used it for two years as my daily driver and it worked 100% of the time without any issues. I never gamed on it though, so I cant tell you anything about that. Yast would be the strongest argument for openSUSE as well as 1-click full disk encryption with encrypted boot and secure boot from the installer. I hope this can help you with your decision, have a nice day :)