Video games present a challenge to any monitor. Their fast-moving, sharply-defined graphics can appear blurred on some sets during parts of a game. In selecting a monitor to use with a gaming system, the most important consideration is frame rate. A monitor with a high frame rate will help to avoid the blurring.
Frame rate is usually described at hertz, or Hz. The higher the number of hertz, the faster the set is refreshing the frames. Plasma monitors are excellent for gaming, because they have exceptionally high refresh rates, often around 600 Hz. LCD monitors can be acceptable for gaming if their refresh rate is 120 Hz or higher.
If all other specs on a plasma or LCD monitor are the same, a plasma monitor will likely produce the sharpest images for video games, but an LCD monitor with a high enough Hz will probably not look much different.