I bought a gaming laptop years back and its pretty bad. Graphics driver keeps crashing and I get like max 60 frames, the screen refresh rate is 59 hz

Im currently diamond now and I was just wondering if its really going to make a difference if I go and just buy a PC.

Anyone who plays on 144hz and has a decent gaming rig, is it worth the upgrade? Im really considering it but I dont want to waste money if I wont see any type of change in my gameplay. Im also worried about not getting used to playing on a new setup, how long would the transition take before I start to feel comfortable with it?