Board Thread:Wiki discussion/@comment-4881935-20130327060139/@comment-6301771-20130329020739

ClariS wrote: I just like diameter on AoE abilities as it gives a sense of how much total space your are dealing.

To a degree. The one use I can see for diameter is determining the maximum distance between two people where you can get to hit both of them, but that's basically the only use for diameter, and that can easily be converted to radius by determining where you'd have to place your shot, seeing as radius is the distance from center (mouse) to the enemy.

Radius, in general, is just more useful. It's used in equations of area (Pi * R ^ 2), it's used in determining maximum effective range (Range + Radius), it's easily converted into diameter (2 * R) and, in general, is of the same measurements as almost everything else. Range for any ability is a radius, as every targeting area for every spell is a circle.