I will submit my answer in the form of an article:
<a href="http://www.gamasutra.com/blogs/LarsDoucet/20150217/236674/Game_Maker_Security_and_Freedom.php" rel="nofollow">http://www.gamasutra.com/blogs/LarsDoucet/20150217/236674/Ga...</a><p>My vote is for Haxe :)<p>Summary: depends on your specific needs and where you fall on the security/freedom threshold. Do you have some more specifics about your project rather than just comparing the two in the abstract?<p>(Also as josefiene pertosa pointed out to me on twitter, you can use Haxe's C# target in conjunction with Unity so the answer can easily be "and" instead of "or")