The ones I was always most happy to get as a kid (no real order of preference, just WOO! SCORE!)
Reese's Cups
Twix
Kitkat
Malted Milk Balls
Zagnut
Clark Bar
Butterfinger
Mallocups
Marathon
BarNone
Almond Joy
Mounds
100,000 Grand
The odd man out in this bunch is... Smarties. Don't know why, but I've always loved Smarties.
I was never all that happy wtih 3 Muskrats, Milkway, or Snickers. Although Snickers is OK.
The ones that I would actively trade away?
Skittles, Milk Duds, Lemonheads, Sourpatch Kids, plain M&Ms, Tootsie Rolls, Tootsie Pops, Mike & Ike, Hot Tamales, and a few others.