The fuel economy difference is minor between the Hemi and Hurricane, but the Hurricane has a bit more hp and especially torque.
If the Hemi feels strong enough for you, then get the Hemi. As already mentioned, I would wait until the Hurricane is been on the market a few years to make sure there isn't any major issues. Though not sure I would trust RAM to iron everything out anyways, as the Hemi isn't exactly devoid of any legacy issues either.
That being said, in several years, you likely won't have many choices other than a Hurricane if you want a gasoline engine in a Mopar product.