I love chocolate so much, maybe a little too much, so I am not very picky at all.
My all-time favourite chocolates come from two country-specific chocolatiers, so I don't want to name them because I'm paranoid, but they are so damn good. So aromatic and fresh and just... melt in your mouth. The only downside is that they're not cheap, so they're a rare treat, but they're worth every penny.
I also really enjoy the Ritter Sport vegan chocolate with the roasted peanuts (basically inhaled one of those bad boys just yesterday), and I have a particularly huge weakness for white chocolate. The Lindt vegan chocolate with the hazelnuts in it is also quite good.
Before going vegan, I also loved Milka chocolate. The white chocolate, the "cow spots" one, the caramel-filled one, and the one with the Tuc crackers in it were my favourites. Also, anything from Lindt, Cadbury, Kinder and Ferrero, plus Reese's and Snickers.
Again, I just really love chocolate, lol.