Decision factors between Plesk and Parallels Automation

[acodring]

Hi there,
I'm looking to understand who Plesk and Parallels Automation are suited to - high level "if [this], then Plesk; if [that] then Automation".

I'm not actually making a decision, just trying to describe who uses Plesk vs who uses Automation to someone unfamiliar with both.

Think of it as "Choosing a Parallels panel for dummies". I may or may not be the dummy.

Thanks in advance for any comments,
Andrew
[I've cross posted in Plesk and Automation forums.]