Yes the main difference I think is that the swaro can toggle the fluid resistance completely off, while the gitzo claims it's an all-in-one package, that is: if you rotate the head swiftly the resistance will automatically decrease.
Or to quote: "The Fluid Gimbal Head cartridge also features an innovative fluidity control system, the Whip-Pan, which delivers superlative device control with high-speed movements. This device applies automatic friction, excluding fluid rotation on the head’s panoramic axis and maintaining smoothness at low rotation speeds, as typically required in video heads. Users have full movement control as they shoot, so there is no risk of shocks or vibrations. At high rotation speeds, when it’s time to quickly reposition the camera, the whip-pan instantly excludes fluidity, allowing free movement without lifting the tripod off the ground. Fluid rotation is automatically and instantly restored when the rotation speed decreases. "
I actually compared both heads in a store (but not on a tripod, yeah I know :/) and ended up buying the gitzo because the fit and finish seemed of better quality (the rubber on the swaro already looked worn, and the "Noir Décor" finish of the gitzo seems sturdier) whilst all else seemed equal. Also, the quick-release plate that comes with the gitzo is longer than the one of the swaro.
But since I currently can't field-test it, I posed the aforementioned question as I had some doubts on wether the amount of resistance wouldn't be bothersome in certain situations where quick action is required. Anyway, I think I'll just stick with my first choice, we'll see along the way.