I don't think the difference is that huge

Did you set your resolution correctly with the analog one? Or the video card is able to drive the LCD at its native resolution? I'm using both analog and digital inputs on my LCD display (so I can use it for two computers at the same time) and I can't tell the difference for most of the general tasks, such as web-browsing, text-editting, movies-watching, etc.

Digital is the future, though.