Well, I've only visited two of the Cedar Fair parks, Cedar Point and Canada's Wonderland, so it's really a comparison between the two.
1. Canada's Wonderland - I have some obvious bias with CW being my home park, and I visit there a lot. The coasters are not amazing, though I love Leviathan and some of the flats. The atmosphere, especially with the fountains/mountain in the entrance plaza is really nice. Bonus points for admission to the water park being included in the normal pass.
2. Cedar Point - I visited only a few days ago, and I think my expectations were too high going in. They have an amazing coaster selection, and some great quality coasters (Raptor was a welcome break from the SLC at CW). The rides were walk on because the local area schools had started. However, I happened to visit on a hot day so I really noticed the how few trees there were in some areas/amount of concrete everywhere, and just the lack of landscaping compared to other parks i've visited. I ran into some nasty ride ops who seemed like they didn't really care about their jobs. I'm hoping I just visited on a bad day.
1. Canada's Wonderland - I have some obvious bias with CW being my home park, and I visit there a lot. The coasters are not amazing, though I love Leviathan and some of the flats. The atmosphere, especially with the fountains/mountain in the entrance plaza is really nice. Bonus points for admission to the water park being included in the normal pass.
2. Cedar Point - I visited only a few days ago, and I think my expectations were too high going in. They have an amazing coaster selection, and some great quality coasters (Raptor was a welcome break from the SLC at CW). The rides were walk on because the local area schools had started. However, I happened to visit on a hot day so I really noticed the how few trees there were in some areas/amount of concrete everywhere, and just the lack of landscaping compared to other parks i've visited. I ran into some nasty ride ops who seemed like they didn't really care about their jobs. I'm hoping I just visited on a bad day.