Without monitors pretty much PC's are useless. They offer views to everything from games, photos, and video, and also its a viewing guide to all the apps you have stored on your computer. Knowingly, manufacturers are aware usage is different with each; that's why the market is saturated with several options.
Either way, what's important is how your computer used in terms of what you're looking for in a monitor. If you're engaging mundane task on the PC such as web surfing, reading and sending emails, you'll likely elect for the cheaper monitor. Graphically intense gaming, viewing HD video, depending on your budget, lean towards getting a 5K, 4K, Quad HD or HD would be your best option. With that said, you need to ask yourself several questions before purchasing a monitor. What I'm looking for in regards to refresh rates and response times? Do I need a flicker-free, low blue light, G-Sync, or Free-Sync monitor? The answers to these questions are in this written post.
Enough with the rambling, now its time I aid you readers on what you should look for when buying a PC monitor.