I think the reason why everyone wants the FTW PCB is because of the second bios...with the idea that someone will find a way to override/workaround nvidia's voltage lock, enabling a different vbios to be written, and thus achieving higher overclocks. If this is in fact the case or at all possible, then the liquid cooled option is probably going to be the card that handles the increased heat by upping voltage the best, in keeping a stable overclock. (of course factoring in silicon lottery--if I understand this all correctly, I'm sure someone else here knows a lot more than I do.)
I would've considered Gigabyte's option originally even though the aesthetic matches nothing in my rig, but if I can't replace the fan...well, I don't trust stock fans on anything, terrible experiences, and I will not cut/remove solder on an 800.00 product and void warranty.