First off, those two aren't necessarily mutually exclusive, if that's what you were implying. Imagination leads to ingenuity, which thus leads to multiple methods of problem solving. Intellection can also lead to ingenuity and thus the ability to problem-solve. I think that imagination, however, is ultimately more useful, as having intellection doesn't necessarily mean you'll be able to achieve what is yet unachievable, especially if your understanding is flawed in some way you can't really control. The real question I must ask you is whether you think imagination is devoid of logic/reality wholesale with this situation you ask, and similarly, I must ask if you think intellection is devoid of imagination/assumptions/hypothesis. I personally believe it's impossible to be imaginative yet not intellectual, and intellectual yet not imaginative.
Both complement each other, one without the other is near pointless.
GAY NIGGERS WHO STILL SUCK SAUSAGE
EGG BACON GRITS - SAUSAGE
is the superior faculty.
Reminder the Nazis were literally losers