On servers I've stuck with Ubuntu LTS's since 2017. They've always been rock solid, even if the 2-4 year upgrade can be time consuming, it's not often enough for me to try something else. The support and documentation is excellent. I find it hard to think of a single reason to even try something else.
On the desktop I probably have spent most time on Ubuntu, or Ubuntu derivative like Kubuntu, but I now use EndeavourOS and I have no plans to switch or hop or try anything else. So I'll likely end up on Endeavour far longer.