When comparing Cortana vs Spartan, the Slant community recommends Spartan for most people. In the question“What are the best power user tools for Windows?” Spartan is ranked 46th while Cortana is ranked 47th.
Ranked in these QuestionsQuestion Ranking
Pro Can recognize music
You can ask Cortana what music is playing and she will attempt to identify it.
Pro Will let you know when artists you're interested in play in your area
Cortana monitors your Bing search history, social network actions, music played, etc to find out what are your favorite artists and will let you know if they plan to play in your area.
Pro Can automatically save screen shots as JPEGs
Pro Clip Viewer
Just move the mouse over the clip slots and you see a preview in the viewer - Text or graphic.
Pro Log on System
Spartan will not only fill in your user name and password but will also select the three characters that some sites ask for from your memorable word.
Pro Script Langauge
Allows you to program multiple copy / paste operations from a single click.
Pro Encrypted log on system
Pro You can include the current date and time in clips
Have the current date and time added to your signature block in any format you wish.
Pro The window can be sized separately for multiple monitors
If you have two monitors, for example, one standard VGA, and the other a high-res 28-inch, Spartan is the only app that lets you choose a separate magnification for each.
Pro Auto shrinks digital photos when pasting
There is an option to have graphics reduced in size when pasted into emails or documents. Really useful if your pics are from a 15 Megapixel camera.
Con Functionality is limited on non-Windows devices
While Cortana is available on Android and iOS, certain features on those operating systems are either limited or non-existant. For example, there's no hands-free voice activation on iOS, and on Android it's only available on the homescreen and nowhere else, etc.