Kettle vs akorn for grilling ...
The akorn doesn't get hot on the outside, it has a convienent hinged lid with stove piping for insulation. It also has a cast iron grate with a removable 2nd grate on top. The vents are easiler to use and you can move them during the cook with your bare hands. None of those features are on a weber kettle.
The kettle is actually somewhat primative.