I like all of them
Daphne's a fashionable kween
Velma is always exposing those heauxs
Shaggy's addicted to food, just like me
Fred is a qt
And Scooby is a dog and who doesn't love dogs
I only like Scooby, but that's because the depth of his character emotionally deep, captivating, and relatable. I've never seen a character with so many layers. His creation is truly an accomplishment and reflection on today's society with biological and psychological implications as well. His relentless addiction to Scooby snacks offers a metaphoric example to real life substance abuse issues.
On the outside he appears as if everything is joyous, but it's simply due to the trance addiction his addiction has enclosed him in. There is a distance from him and the other characters as they actively function in society, being a positive contributer to society (performing detective work competently) while Scooby and his tragic enabler Shaggy aren't able to live up to those expectations.
Bottom line is Scooby is treated like a dog, which many of those who struggle with addiction can relate to all too well.