I found coming up with my top three difficult, which is surprising given I don't like glitter. Slendy is particularly unique to my collection and I was surprised by how much I liked it. The following made it in to the top three.
Weird Sister is quite a unique polish, a thermal that goes from black to clear with added glitters. I haven't owned a thermal that goes clear prior to this.
In second place,
Couldn't Miss This One This Year which again is a very unique polish to me. Everyone has heard of thermal changing polishes whereas this one actually changes colour in direct sunlight. Blue to purple colour change packed with flakies.
Which means the winner is
Magma, which is a flakie topper. The colour shifts in this duochrome is stunning, all of the autumnal colours in a polish. Also it looks great with a matte topcoat.