I like them all, but Adventure Island is my least favourite of the four. It's a very solid park in many ways, but I think it needs a "thrill" coaster with steep drops and airtime. I regret I couldn't ride Cyclone at the Kursaal, so part of me has always hoped they'd get a woodie, or at least something that gives that kind of feeling - something like Wood Express at Parc Saint Paul would be great.
Next I'll put Dreamland, Margate. The "Bembom Brothers" days were something special, but I actually loved the park most during the 2001/2002 seasons when it had the Schwarzkopf Silver Arrow. It still has a lot of potential, but I've always believed it needs to be a well-rounded amusement park, not just a nostalgia/classic park.
I have more of a soft spot for Fantasy Island than many. Millennium Coaster is still one of my favourite rides - the place had a lot of ambition from the moment it started, but to suddenly gain a massive Vekoma encircling the complex was something special. Over the years, it's generally had better rides than most other seaside parks.
My favourite, though, is Great Yarmouth Pleasure Beach, because of the fine balance of heritage and good rides. I used to love the Break Dance and Flying Carpet, and also remember the Water Chute. The star of the show is, of course, the Roller Coaster. Smooth and with five good drops (especially the 2nd one), to me it is the best woodie in England.