If you can find a clean or import a genuine car then go for it. The new Prius is better then second gen in all most every way. It rides better, it is more powerful, is more better looking, has more features like more air bags and better speedometer with real time information regarding mileage, it is also more practical. Now coming towards fuel efficiency, it is almost the same as the second gen as it has a bigger engine but better aero-dynamics and bigger batteries. If you go for G-Touring leather selection package, then it has electric/heated seats, radar guided control, leather package, JBL sound system, handsfree bluetooth, auto dimming back view mirror etc. Lastly third gen Prius is more durable, it has less belts and relies more on water cooled systems.
The only drawback the new Prius has is that it is not that spacious as second gen, the dashboard layout extends towards seats which makes it a bit more cramped as compared to second gen Prius.