Well, they are usually bigger for the price, but you are intended to sit farther away, so the size becomes a wash. Larger the screen at the same resolution, the bigger or more widely spaced the pixels.
Refresh rate: (How many times per second the screen is redrawn) TV 60/120/240/600, Monitor: 60/120/144
Response time: (how quickly individual pixels can change, the faster it is the more 'ghosting' is prevented) average monitor 5ms (1-2ms for good ones), IPS panels 5-11ms, some TVs can go as high as 17ms
Input Lag (How much time the video signal take to get processed before being displayed) This varies greatly, but TVs are almost always worse. Only the most expensive have reasonable input lag. (google top 20 gaming TVs)
Brightness, TVs usually take the edge on this
Contrast, Monitors are usually better.
Color reproduction, TVs beat out the cheaper TN style monitors, IPS monitors are designed for Color reproduction.