A 144hz monitor has different sweet spots than 60 or 120hz monitors.
24, 36, 48, 72 and 144 are the sweet spots for a 144hz monitor.
24, 30, 40, 60 and 120 are the sweet spots for a 120hz monitor.
If you try to maintain 60 FPS with v-sync, you'll find it is worse than on a 60hz monitor, but 48 and 72 are better. That said, you can adjust the hz of the monitor to what ever your needs are.