Ok you want a comparison heres the deal im not rooting for either because well im a ride operator at knoebels but i will say you get to hear everything when your a ride operator at either park.
Knoebels the entry and entertainment is free all you need is a pass which is 39 bucks or on bargain night 10 bucks or get tickets which is fine. Knoebels has award winning merry go round,food,and certainly good workers. We get complaints about hershey when it comes to handicap people and prices and such.
Hershey may have more roller coasters but they treat their handicap guests like junk plus you have to pay for parking and admission and rides which can earn them money but like i read you have long lines so you wait forever.
Knoebels the prices are usually 2.50 or 4.50 for drinks or most food depending on size,also customers get away with too much and they hire just about anyone at knoebels.
Overall though id probably say come to elysburg just to see knoebels and then next day go to hershey