Doesn't really matter... Bring a wide variety. Snickers are great but keep it in your coat pocket (i.e.warm).
We had a huge variety of stuff - snickers, M&Ms, trail mix, jerky, fruit stick things, cheez&PB crackers, Cheez-it, rice kirspy treat, nutri-grain bar, chocolate, good&plenty, who knows what else. We established n planning various combinations to provide the calorie load we needed for a particular day, together with breakfast and dinner.
Most of that stuff can be eaten frozen, something to consider.
Pack your snacks up in daily rations and try to get through it all. That way you're getting the calories you need and also eating the stuff you really like and the stuff you're sick of in equal measure. If you have everything all combined for the whole trip you won't keep track of how much you "should" eat each day and also you'll favor the good stuff first and be left the gross stuff on the second half of the trip. (When you need it most!)
If you find you brought something you don't like find someone who does and trade. You'd be surprised what people might want to give and take out there...