Mint with Cinnamon on the desktop because it’s not flashy or unique in any way. I have actual work to get done and I just need the OS to get out of my way. I’ll customize my shell environment but only for productivity… I’m not spending hours tweaking my DE theme or color palette or whatever.
Server side, where I spend the overwhelming majority of my time, the base OS doesn’t really matter. I am entirely in kubernetes so that’s mostly all abstracted away.