IMO CVT is better than an automatic transmission, be it fully auto or even ECT/super ECT.
i think we are talking about comparison between vios and city isnt it?
CVT delivers power by mechanical where else an automatic transmission uses ATF as medium so, there is noticeable loss of power.
advantage of CVT - no need clutch system, continuosly varies to suit engine speed and vehicle speed, with programmed ECU (like City) virtual gears can be preset while loss of power is minimal.
actually, toyota also has CVT models but local franchise dealer decided to stick to traditional market of selling in auto and manual specs while Honda took radical approach by making available CVT models.
if not mistaken, Subaru was first to mass produce CVT cars about 2 decades ago
best thing is to roll this page up and use Google search. its there to help us.