best database

Hello, I can't seem to find this after doing a few searches, I just purchased xenforo and I am wondering? 1. Best OS centOS 7 or 8 vs Ubuntu 18 or 20 for xenforo v2.2.1 2. Best performance DB Mysql 5.7/8 vs Mariadb 10.3 or higher 3. I have 2 servers both are identical * Dual Intel(R) Xeon(R)...