It is recommend to use Native Resolution, the resolution at which monitor is designed to display without conversion for the best blur free viewing.
You can find out the Native Resolution by checking the product information.
CRT / LCD Desktop Monitors:
14" - 15" = 1024 x 768
17" - 19" = 1280 x 1024
12" - 16" = 1280 x 800
To change resolution:
1. Right click on Desktop
3. Display Settings
More from Microsoft - Getting the best display on your monitor
Windows chooses the best display settings, including screen resolution, refresh rate, and color, based on your monitor. These settings differ depending on whether you have an LCD or a CRT monitor. If you want to adjust your display settings or, if these settings were changed and you want to restore default settings, use the following recommendations.
For both type of monitors, it's typical that the higher the dots per inch (DPI), the better the fonts will look. For more information, see Make the text on your screen larger or smaller.
The best display for an LCD monitor
If you have an LCD monitor, check your screen resolution, which helps to determine the clarity of on-screen images and objects. It's a good practice to set LCD monitors to the native resolution—the resolution a monitor was designed to display best, based on its size. The monitor manufacturer or reseller should be able to provide the native resolution. If you can't get this information, you can try setting the monitor to the highest available resolution, which is usually the native resolution. See Change screen resolution.
LCD monitors can technically support lower resolutions than their native resolution, but the image might be small, centered on the screen, and edged with black; or the image will look stretched.
Correct monitor flicker
Another consideration in getting the best possible display from your monitor is the screen refresh rate. If the refresh rate is too low, the monitor can flicker, which can cause eye strain and headaches. You should select a refresh rate of at least 75 Hertz. For more information about reducing or eliminating flicker, see Correct monitor flicker (refresh rate).
Set the color for an LCD monitor
LCD monitors display vivid color. To get the best color display from your monitor, make sure the color is set to at least 32 bit.
The best display for a CRT monitor
For a CRT monitor, it's important to change the screen resolution to the highest resolution available that gives 32-bit color and at least a 72-Hertz refresh rate. For more information, see Change screen resolution. If the screen is flickering, or viewing the screen is uncomfortable, increase the refresh rate until you are comfortable with it. For more information, see Correct monitor flicker (refresh rate).
Set the color for a CRT monitor
Windows colors and themes work best when you have your monitor set to 32-bit color. You can set your monitor to 24-bit color, but you won't see all the visual effects. If you set your monitor to 16-bit color, images that should be smooth might not appear correctly.