Dreamworld. Movie world really only has 4-5 rides and you pretty much run out of stuff to do after a couple of hours, and Seaworld is more like a zoo than a theme park. Wet and Wild is really good on a hot summer's day but nothing in the way of rollercoasters! Plus if you go to Dreamworld in the warmer months you can get a hopper pass and go to White Water World as well - keep an eye out for shopper dockets if you go to a Coles or Woolies in the area because they often have adults at kids prices and that kind of thing. White Water World also has a water slide roller coaster that operates using magnets which is pretty cool and they have some big thrill slides as well - one that DH and I call the Giant Dunny because its like dropping down into a giant loo and getting flushed! Its awesome!

Dreamworld is definitely the best of them all, even if it is a little more expensive - I would suggest bringing your own food if you want to save some money because like all theme parks the food is seriously overpriced. Tbh as someone who grew up with those theme parks, I wouldn't be miffed if I never went to Seaworld and Movieworld again.