Are CVTs as reliable as traditional automatic? Why do so many new cars have them?

I'm about to get a new car and the ones I want all have CVT transmission (Honda, Nissan). I don't know why they don't include an automatic option. Specifically I'm interested in the Murano. I heard Nissan CVTs aren't as good as Hondas?

I tend to drive my car 200k miles and keep them for 20 years so I need to make sure CVTs can last that long.

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