Dunlop0078 :
Well in terms of VRM and overall PCB quality the FTW2 is the better card. Both have the ICX cooler and sensors but the cooler on the FTW2 is a bit bigger. In terms of performance they will be near identical.
I would say the classified is ridiculous overkill for anything other than LN2 overclocking. They do bin chips for it, but from what I have seen on air it doesn't clock much higher than any other 1080 with a decent VRM and cooler.
I know, but I thought I would point it out just in case.
I have a GTX 1080 FTW2 and it's a monster over clocker. Found that out when I pushed it for the Superposition thread.... Took a custom water cooled GTX 1080 to beat me and it wasn't by much.
I still had more headroom on the memory, but I stopped and said good enough.
I got 2113 GPU and 5940(11,880) Memory (No voltage adjustment) at 67C MAX with stock fan profile.