Here are my observations owning both DCT and CVT cars over past 5 years.
Among all the types of transmissions, DCT is the most efficient as it doesn’t let fuel go to waste during shift in transmissions. Both CVT and DCT are good at fuel economy; however, if you want something that gives you an edge, then DCT transmission is the one for you.
Automatic transmission cars are generally reliable cars and both DCT automatic and CVT automatic cars are similar in terms of reliability and maintenance costs. However, both DCT and CVT automatic gearboxes will require a complete replacement of the gearbox in case of damage. These attract a high cost to replace, and regular maintenance with proper driving practices will ensure the longevity of either transmission.
Driving experience
This is where DCT automatic surpasses CVT automatic. In CVT automatic, since transmission is based on pulley and belt system, and pulley is what transmits power, there’s a distinct lack of response in power flow. A CVT automatic tends to cause a rubber-band effect and takes away the thrill of power that driving enthusiasts prefer. In dual-clutch transmission, although the selection of gears is automatic, the gears mesh the same way as they do in manual transmission, which provides spirited & high-octane performance. This is why DCT automatics are commonly found in sports cars.