Currently, there are three different types of gaming monitor panels: TN, IPS, and VA. However, the most common types are TN and IPS.
TN (Twisted Nematic). This type usually has a lower color reproduction. This means that the colors can be slightly less sharp compared to IPS and VA panels. The contrast and brightness can also change depending on what angle you are viewing the screen.
However, TN panels have a quicker response time than the other two, only 1 ms. One pixel takes one millisecond to respond to the change of color. This is why professional gamers often go for this type of panel rather than IPS or VA.