These appear to be remarkably similar in their standard features and included palette of plugins, except that Pro Tools is free, and Sonar Artist is $99. Could this turn-out to be an ingenious tactic from Avid? Is there potential for this to be detrimental to the sales of Sonar Artist or even Sonar Professional? I'm thinking it could actually be putting a cat among the pigeons. Very shrewd Avid! If someone were to be clever, they could take Pro Tools Free and then spend $199 on desired third-party plugins and easily end-up with a package on-par with Sonar Professional.
It appears that Avid is offering an attractive means for producers to get familiar with the Pro Tools methodology, as if Avid is saying "Come and see why Pro Tools is better, use it with the same editing features as the full version etc, you wont be disappointed, and it's free, so you've got nothing to lose."
It is limited to a total of 16 midi tracks and 16 instrument tracks and 16 audio tracks total, but that is basically a free 48 track studio. More than sufficient for many home producers.
The other amazing thing is that it doesn't require iLok protection to use it.
The Free version of Presonus "Studio One" has no show next to this, because it won't allow use of any VST plugins.