This depends entirely on what you want to do with your laptop. Generally, a larger screen is better as it allows you to see more, but there are benefits to different screen sizes. A 12-14” screen is quite compact and is useful if you need a laptop that’s ultra-portable. If you want a laptop for general day-to-day use, then 14-16” is the standard, but if you need a laptop for creative work or gaming, 16+” allows you to see more and fit more on screen at once.