Stellaris vs. Galactic Civilizations III: Which is the better 4X strategy PC game?

[Windows Central]

To Stellaris or Gal Civ, that is the question.
Fans of sci-fi strategy games are spoilt for choice, and two big names in the genre are Stellaris and Galactic Civilizations III. The former is the first release for Paradox Interactive, while Galactic Civilizations has been around for years and this is currently the third installation from Stardock. The question boils down to "what are the differences between the two, and which (if any) is the better choice?"
I'm going to run through the pros and cons of each title, should you be a newcomer to both games, and hopefully the choice will be made a little bit easier after you're done.

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