I was a Debian user for ~10 years, the last few years wishing that someone would polish it up into something easier for desktop use. Along came Ubuntu and I jumped aboard. I rolled a customized Ubuntu live distro for a while, which was very useful for quick setup of programming workshops; likely no other Linux OS at the time would have allowed me to do this so quickly and easily.
Then various cloud hosting services and Docker came along, and I was glad for all of the Debian/Ubuntu skills.
One of the unsung niceties that Ubuntu enjoys is solid version-to-version in-place upgrades. I haven’t re-installed an OS on my primary laptop for the past 5 years. Any other Linux OS that I want to take for a spin or use for testing fires up easily in QEMU/KVM through virt-manager.