180 requires more skill due to the fine nature of the skill. You must hit a small target area repeatedly with each attempt becoming progressively more difficult. There is very little luck involved.
The hole-in-one requires huge amounts of luck in my opinion as it is a matter of hitting the ball into a general area (skill) and allowing the undulations of the green to send the ball home (luck).
The skill level involved in scoring a 300 in bowling depends on whether you had the bumpers.
quite clearly you dont understand the art of throwing a dart!
Wouldn't call it an artform tbh.