I live very close to SFA and I can tell you from first hand experience that Dorney is better. However, the price of admisssion is fairly cheap and in addition to there being some good coaster like RoS, Batwing, JJ, and Wild One it has a pretty big waterpark. So I say you should go or wait a few years as in the past few years the park has been improving greatly in terms of cleanliness and overall quality.