My Pyr'o Lantern because I got it after like 3 cases + it's part of my favourite set.
Also my least favourite is my Strange Snowmann. It's boring, doesn't match with any cool sets and is also rarer than an unusual in an old crate because of it being a Strange Elite Grade. There is an alternate timeline where I got a Burning Falkirk Helm, or a Scorching Hong Kong Cone, or anything else.