monitor hz

Hi , I'm planning to upgrade my monitor . I'm split between getting a 75 hz or 144 hz one . I'm worried that my pc might not handle some games "I dont play any new games" at 144 hz and the image might be bad or something . Mostly I play dota 2 CPU - Ryzen 3 1200 OC to 4,00 ghz GPU - RX 470 4...

So I am buying a laptop for light gaming playing games such as rainbow six siege here is the link to my laptop. https://www.newegg.com/obsidian-black-acer-aspire-7-a717-72g-700j-gaming-entertainment/p/N82E16834316435?item=N82E16834316435 I’m going to buy a monitor with a better hz and I’m...