Analog inputs have more visual effects than digital ones (typically).
In many respects & not just that of computers, analog signals has one advantage over digital, these may fade, yet not always break completely. A good example of this was crossing under a bridge & the radio (or cell phone) would fade, and kick right back in. With digital, the signal is there or it's not.
So for anyone that still has some useful analog accessories, it's good to take care of these, as the shift to digital, even with computer monitors, is accelerating. Displayport has taken over DVI even in the consumer market & we know that that means, VGA is getting kicked to the curb. Many computers no longer has a VGA port, only HDMI & DP, and DVI-I & DVI-D on discrete cards. Though adapters for VGA are still plentiful & cheap, many computers may have a HDMI to VGA converter included, as well as some monitors, oddly even if these doesn't have a VGA (sometimes called RGB) port.
This may also depend on the graphics that you have. built in, or a dedicated card. By chance if AMD graphics, you'll have some issues with Ubuntu 16.04 that's yet to be fixed (hopefully will be soon). Since you didn't mention which brand of graphics you have, felt it best to add this information.