It's certainly in the same general category of nanotechnology-enabled non-volatile solid-state memory technologies. Off the cuff, I would guess (emphasizing gu

It's certainly in the same general category of nanotechnology-enabled non-volatile solid-state memory technologies. Off the cuff, I would guess (emphasizing guess) that memristors will have better access times while racetrack looks like it might be denser. But the big question is manufacturability. There's already a pilot project to produce memristor memory. Racetrack, even if it's superior in the abstract (and I'm not sure it is), might just be too late to the party. It's not even completely clear that memristors will edge out flash, which after all has massive momentum at this point, but I think the odds are good -- memristors are (or can be) much faster.