The FTW is binned better. Evga sets the highest clocks on the FTW, after they are built. Those that pass, stay FTW, those that fail become FTW DT. So you'll get maximum 'out of the box' performance from an FTW. But, if you plan on OC, then it's pot luck, it's the same processor, but whether it'll hit FTW levels or beyond and remain stable is anyone's guess. Same sorta goes for the FTW though, it passed stability for the set clocks, but how much is left no one knows.
FTW, better out of the box than non-FTW. Only real advantage.