Why would you want to use Motion over Vector Motion

I'm struggling to understand the difference between Motion and Vector Motion and don't know why you'd ever use Motion over Vector Motion. I'm coming across a lot of difficulty because of the Motion section and wish there was just one way to transform. 

I've only just understood that there's a difference and I've been using a shortcut that modifies the scale using 'Motion'. This works perfectly for quickly ammending the scale by +10 or -10, but I get the issues with the parameters, where media goes outside of the box etc. Now that I know this issue is coming from the Motion panel, it would be good for me to find a way to do that shortcut using the Vector Motion panel but it doesn't seem like there is a way.

I've also tried using the Transform, but when scaling up this just stacks loads of Transforms and there's no way to scale down using this method.