LCD Monitors are cheaper to buy than LEDs. However, unless you are a Games Fanatic, or possibly a Graphic Artist/Designer, then it's doubtful that you will really notice any difference.
LCD's do have the advantage of one being able to view the screen more clearly from all angles whereas with LEDs one needs to be central to the screen for best images.........Could be an important factor if a number of folk are viewing say a Video, or playing a game together.
Just make sure you have the correct connection cable between your pc and the new monitor. Their are some good monitors out there from reliable manufacturers at the moment.