Potentially the quality will be better from a PC, but that will depend on the capabilities of your PC.
DVI doesn't carry audio so you will need to configure your audio in some other way, you may also be unable to match the resolutions from your PC to your TV, you may have black borders or alternitively may lose some of the picture at the edges.
If you intend to use the tv as a second display device for the computer you may find your resolutions are limited depending on your graphics card, if you intend replacing your current monitor with the tv instead, you will need to be aware that text will not display very well in many cases (especially when viewing websites).
