Well there's no clear answer here. They both have pros and cons so it's whatever works better for you.
Many TV's below 32" will have lower quality panels (poorer IQ) and usually aren't 1080p which is a must when using a TV as a monitor. Most monitors use cheap TN panels which are sometimes OK, but still can't compete with the IQ of IPS & PVA based displays which is what most TV"s 32"+ use. But there's plenty of affordable monitors with IPS panels.
A monitor offers better sharpness because of it's smaller size. That is until you get into the resolutions beyond 1080p where you get size and sharpness but at a pretty high cost both with the monitor and the PC hardware to push the extra pixels. TV's tend to have more input lag than monitors which might be an issue if you're really into online multiplayer.
A bigger screen is more immersive, there isn't any way around this. It's also much better for video, but sometimes a large display on a desk isn't viable. If this is a gaming only setup than a 23-24" monitor may be the way to go as both sharpness and lower input lag can affect gameplay, though usually to a minor degree. If you want more "wow" factor than a 32" HDTV is what you want. The 32LK450 would work well.