At the moment, it is all about those feels. There are not concrete stats, and not enough information to detail which would be better for you. You could start any arguement to claim that one is better than the other, the rover of the Aquila, the extended fuel tanks of the Dur, the larger crew size of the Aquila, the engine power of the Dur, it is just a pointless tug-of-war.
If you feel that the Aquila is more your thing, and you are willing to cough up the moolah for it, go for it. You can always get the other when the game comes out, just get what makes you happy.
There is one solid bit of advice I will lay out there for you though, the Connie and Freelancer, and their respected variants, are being overhauled at the moment, and by the looks of some of the early glimpses, the changes are quite substantial. Just let it simmer for a while until these changes are fully showcased, they may just give you an alternate opinion.