The price difference should make it quite clear as to which one is better. The 902 is a great case. This 912 thingy is new to the market. Haven't heard much about it. But after looking at the features, the 912 seems a good one for customizing and has more space than the 902.
I'll tell you this much since i have a 902 the construction quality and build is first rate.
Look at how much each case weighs that tells you something imo.
Also the 902 comes with 4 fans including a nice 200mm top exhaust and they're all 3 speed adjustable TriCools.
The case has great cooling and does it quietly.
Not even close to being a fair comparison.
The HAF 922 is its competition.