Mine personally is rogue. While a druid might be able to stealth better, or a fighter do more consistent damage or a wizard solve most problems with magic there's something about rogues to me that I love.
I really try not to play the cliché rogue that acts as a loner or steals from the party. I'm personally more interested in a rogue that isn't a criminal but rather someone who uses roguish fighting tactics.
I like trying to find opportunities for sneak attack and I like being really good at what I'm good at.
My first 5e character was an Arcane Trickster Rogue so I really enjoyed dabbling with magic and the flavor is awesome. Later on, I made a Phantom Rogue and while I didn't get too far with her or use many of her features she was also pretty awesome.
Currently playing a Druid and Wizard in two games which I love, but I'm hoping for at least one more long term campaign that I get to play rogue before I am "done" with 5e.