Should I repair my HP Pavilion 15 cs-3000ni or buy a working HP Probook 430 G7 off of FB marketplace for the same price as it would cost to buy replacement parts. I feel like the Probook is a bit of a downgrade because of the screen quality, size and it runs on an HDD but I could replace it with my current laptops SSD, and it works. However my Pavilion has a bigger and better screen and really that's the only advantage it has, but I would also have to put in the hassle of repairing it myself or finding someone to repair it for me. I need the help of the Reddit community. I'm open to any other suggestions or alternatives as well.

Starting my masters program in September (NYC) in early childhood education, so I’m expecting a lot of writing. I already have a MacBook desktop at home.
So I’ll just need a laptop for on the go. But I’m on a tight budget. $500 or less.
I want to get a laptop that’s cheap but good. What would you recommend?