For convenience, I pretty much use the regular Pokéballs or Ultra balls. Design wise my favorites are the Great ball, Dive ball, Heavy ball, Moon ball, and Net ball. The Timerball is one I like both for both design and usage. As for the Net ball, I like the animation and the design lol. I just noticed how most if not all the balls I like design wise have some sort of blue in them. It's probably another reason I like them since blue and its variations are my favorite color. o3o