https://www.cnbc.com/2019/04/01/apple-airpods-2-review.html

I've been testing Apple's second-generation AirPods, which add a couple of new features including wireless charging, better battery life for phone calls and support for calling up Siri whenever you want by saying, "Hey Siri." They're very good and still my top pick for wireless headphones.

But you don't need to upgrade to these if you have the first-generation model.