I've only been to Fantasia Gardens but really enjoyed the theming. I thought it was a rather challenging course for the seven year old that was with our group (and for some of the adults). But we all still had a blast!
As far as transportation goes, our hotel situation required us to take a bus from our resort to one of the parks, and then a boat over the the Swan/Dolphin hotels. Fantasia Gardens is just a short walk from there.
From what I understand, the Winter Summerland course is very close to Blizzard Beach, so you'd have to take a bus from your resort to that waterpark.