There are several options for leadscrew couplers, listed in order of preference. This is opinion, feel free to test and evaluate yourself.
Figure 1: These couplers are made of two separate pieces of aluminum and a center plastic joint. They center the leadscrew & stepper better than the solid couplers, and are very quiet. Less Z artifacts than either the rigid or spring couplers.
Figure 2: These Couplers are a rigid style. Issues are mostly around centering the leadscrew and stepper shaft. Quieter than a spring style coupler, but can add wobble and some Z artifacts.
Figure 3: These Couplers are a common basic coupler. In testing they were louder than the others, and added Z-artifacts / banding.