My MAG MXE17S has BNC input as well as D-sub input. Would it lead to better 2D/3D image quality if the BNC input is used? Will it be a video cable one end with D-sub for the video card and the other ...

So my POS Nokia monitor died last night while playing UT2k4 and I'm now using my Dell D2026T 20" which has a both VGA and 5-BNC connectors on the back. I currently have a poor quality VGA cable for it ...