* Tab Session Manager loads ALL of the sessions when you bring up the interface, in my case causing it to consume all of the CPU for a good couple of minutes.
* Tab Session Manager does not present me with currently open incognito windows and tabs.
* Sessionic opens tabs in NEW normal (not-incognito) windows when you click on them.
In contrast, I can simply and quickly open Session Buddy and be greeted with a full page (so not just a pop up window) overview of currently open windows and their tabs, when I click on one of them, I'm taken to that tab in that window. If I click on a tab which isn't open (in a previously saved session), then the tab opens in an incognito window.
Seems that only Session Buddy has this behavior currently.