Phantom SP Build.

Well, until the Pirate revamp, Hurricane is better than Rapid Fire, however, assuming the very best conditions, 100% crit, damage cap with both skills (and assuming Carte Noir is fixed), Ultimate Drive hits 333.33 x2 times a minute, while Rapid Fire hits 500 times, if we factor in Carte Noir with 100% crit, Ultimate Drive would do 666.66 hits + 333.33 Carte Noir hits a minute (999 total), while Rapid Fire would do 500 hits + 500 Carte Noir hits (1000 total).

It's a lot easier to cap with RF than Ultimate Drive, and I'm pretty sure capped RF fares better than Ultimate Drive even if the two hits did more than cap together because of its slower speed.

Without 100% crit, there could be a point at which Ultimate Drive overtakes RF since a noncrit RF wouldn't activate Carte Noir, but even a single critical would activate Carte Noir for drive, but it should even out over time, I think.