“There’s a palpable difference between the standard 60hz and a 120hz screen.”
Faster refresh displays are much smoother and more responsive to your touch, Sinclair said.
All displays constantly change the pixels they display to create the appearance of motion.

Apple
Most TVs and older phones have a 60Hz refresh rate.
The iPhone 13 Pro and other high-end smartphones can refresh their screens at a blazing 120Hz.
There’s a palpable difference between the standard 60hz and a 120hz screen.

Apple
ProMotion could give iPhone 12 owners a reason to upgrade to the latest model.
“Apple’s ProMotion will finally bring all these benefits to the iPhone experience,” Sinclair said.
“You’ll get to see that iPad Pro feel in your pocket-sized devices.”
Ive been using ProMotion on my12.9 inch iPad Pro, and it makes a huge difference.
In my experience, doing everything from scrolling through websites to watching videos is much smoother and more pleasant.
Now that Ive gotten used to ProMotion, its hard to use a gadget that lacks this feature.
The display on myiPhone 12 Pro Maxseems sluggish and dull in comparison.
It will be interesting to see if battery life takes a hit with the higher refresh rate.
If all goes well, the iPhone 13 could be a serious contender for watching movies on the go.