The allure of neglected dragons is an automatic one, so you just pop your eggs or hatchlings in and it'll generate clicks. Just gotta keep an eye on your eggs cause sometimes they can get to many clicks to fast.
Daily Dragon fix is more of a manual one, you put your eggs/ hatchlings in but the site does want you to click a certain amount of eggs/ hatchlings in return as well.
I mostly just use those two sites and don't really have any problems with hatching/ growing up my dragons c: