There are some really mixed answers here. I would stick to the mainline distros and not go for a fork with a few customizations. It does depend on what you want, especially if you are willing to learn using the terminal and if you want bleeding edge or more stability. My list would be:

• Debian
• Kubuntu
• Fedora
• Pop!_OS
• Arch Linux (If you want to learn Linux from its fundamentals)