Hershey's Symphony with almonds and toffee bits
&
Galaxy roasted & caramelised hazelnut
I don't like Cadbury (UK..never tried US). It's kind of chalky and greasy all at the same time (IMO) 
Isn't it weird how tastes can vary? And two people eating the same thing can have totally different reactions to it?
I honestly never thought of cadburys as chalky or greasy, I always think cadburys is really smooth, has a good melting temperature in the mouth, but I think Hersheys is disgusting, it's crumby and tastes burnt to me... I'm also convinced it smells of vomit, the Hershey store in times square can be smelt a mile off.
Neither of us are wrong or course, or right, it's all just personal taste, no one else gets the Hersheys smells of sick thing, that's just me!
I guess it's partly what you're used to growing up

Cadburys roses were always a big treat at xmas and we'd get those over Quality Streets.
I agree with you on galaxy hazelnut though - love it!