At Ohana, I prefer the Backscratcher over the Lapu-Lapu. It's less sweet and has more of a bite.
My favorite drink the past few trips was the mango mojito at Petals in Pop Century. The last day of our trip there last summer, they changed the recipe a bit and the name to a Tropical Mojito. The Tropical Mojito was close and pretty good, but not quite the mango version I loved so well.
I really enjoy the drinks in the World Showcase. Love both the Grand Marnier and Grey Goose slushies and the frozen drinks from the stand in Morocco.