bignastyid :
Imho its worth it. No you should not get screen tearing if running below 144fps. Screen tearing usually occurs when you are running fps higher than the refresh not lower. I notice a difference at just 70fps on my 144hz monitor but everybody is different so I can say if you will or not.
Screen tearing occurs any time the fps does not exactly match the monitor's refresh rate. So if you are getting 143 fps on a 144 Hz monitor, it will tear. 145 fps will also tear. Only 144.00000000 fps will not tear on a 144.00000000 Hz monitor. The video card is drawing directly to a chunk of video memory used to send images to the monitor. Every 1/144 seconds, the monitor grabs the contents of this video memory for display. If the fps does not exactly match the monitor's refresh rate, a part of this video memory will be showing the next frame (if your fps > refresh) or the previous frame (if your fps < refresh).
Certain frequency combinations will make the tearing more or less noticeable. If the fps and refresh rate are very close, you will notice the tearing more because it will always occur near the same place - e.g. near the bottom and slowly moving up the screen if your fps is slightly slower than your refresh rate, or near the top and slowly moving down the screen if your fps is slightly faster. Other combinations of fps and refresh rate will cause the tear to jump all over the screen from frame to frame, making it less noticeable. In the latter case, tearing will be less noticeable on a 144 Hz monitor than a 60 Hz monitor because each individual tear will be displayed for a shorter period of time. A tear your eye may have noticed if it stayed in the same spot for 1/60 sec, will be jumping around every 1/144 sec.
The only two ways invented to prevent tearing are:
Vsync - This adds a screenbuffer - a chunk of memory the monitor will never see. The video card draws to the screenbuffer. The moment a complete image has been drawn to the screenbuffer, it gets copied to the video memory thus insuring the video memory always has a completely and non-torn image. The video card continues drawing the next frame to the screenbuffer,. Meanwhile, when the monitor refreshes, it grabs the complete image from video memory and displays it. (There are other variants you can read about if you're curious, but this is the simplest.)
https://en.wikipedia.org/wiki/Multiple_buffering
G-sync or Freesync - The monitor does not have a fixed refresh rate. Instead, the video card signals when it has finished drawing a complete image to video memory. The monitor then grabs this image and displays it, before the video card has had time to start overwriting it with the next frame.
Since OP already uses vsync, there is no tearing. The only benefit of moving to a 144 Hz monitor will be smoother animation. He'll see up to 144 fps, instead of up to 60 fps.