If priority is motion fluidity, you want framerates matching Hz.
- Powerful GPU to keep frame rate matching refresh rate
- VSYNC ON with various low-lag VSYNC ON tricks
- Frame rate cap
If you want more flexibility with varying framerates -- then you want variable refresh monitor such as a FreeSync or GSYNC monitor, see
Demo of variable refresh rates which can eliminate stutters of varying frame rates. On such a monitor, the refresh rate stays in sync with frame rate, which makes it much more seamless.