Q: out of all hybrids
A: Right now there are three different types of hybrid drive systems in production cars: - Hybrids that use the Power Split Device transmission, - Hybrids that use the GM 2-mode transmission, - Mild hybrids that cannot move the car on electric alone (Honda IMA, GM BAS). The best hybrids IMHO are the ones using the Power Split Device transmission, because they are mechanically the simplest. The PSD transmission has just one planetary gearset, no hot-running torque converter, no clutch, no gear-shifting wear-and-tear. This simplicity means better reliability and less required maintenance (less moving parts). The PSD-equipped hybrids are: - Ford Escape Hybrid (and their Mercury and Mazda rebadges). - Nissan Altima Hybrid. - Toyota Prius, Camry and Highlander hybrids. - Lexus hybrids. If you want a hybrid car, I would recommend any of the above. How the PSD transmission works: http://eahart.com/prius/psd/ The Honda IMA system uses a friction-belt-and-pulley CVT transmission. The GM BAS system uses a large alternator/motor that is belted to the engine, with a 4-speed automatic transmission and torque converter that is the same as a regular car. The GM 2-mode system is the most complex, with a 4-speed automatic gearbox with 2 clutches that engages the electrical motors. All of these are far more complex and have a lot more moving parts than the PSD transmission, and more complex mechanical devices tend to have more potential failure points. Hope this helps.