Ok, I'll bite.
My three cups: My favorite, my yixing, and the ugly goodwill indestructible wonder. Sadly, 9 out of 10 times, it's the Ugly Goodwill cup that sees prime sippage.
Why do I call it an indestructible wonder? Because this is what happened when I dropped one from 7 feet onto the concrete floor of a garage. (Long story, don't ask. I'm a stupid klutz who brings tea everywhere.)
If I wanted, I could super glue the two halves back together and no one would be the wiser. I don't think I'll ever manage to rid myself of them.