What's your favourite creation process's step ? And the worst in your eyes ?

For example I love doing the sketch ! Trying different shapes, different designs, doing the poses and dynamics of my drawing.

But if I work on a 3D piece I'll preferably when the research are done and I can craft it !

Otherwise, when I'm drawing I HATE making the line because of how boring it feels haha

What about you ? Any favourite step of the process?