[jesyflowers]

For me, i believe both are important, and i have to find a balance between the left arm swing speed and the power/speed with which you can release.

For me this is mostly a matter of squaring the club. Focusing on dragging with the left / releasing/rotating over with the right will make me fade/slice or hook/draw the ball.
Once i've made a conscious effort in either direction, it's hard for me to get back and "just swing".