Amazon's Echo was the first smart speaker to find its way into millions of people's homes. Since the original Echo launched in 2014, Amazon has launched several new versions of the original speaker as well as a host of other Echo devices that have Alexa voice control built in. There are so many different Echos now that we've put together this guide to help you find the best one for your needs. Before we get into the specifics, though, it's worth pointing out that there are some features every Echo has, regardless of its specialty. All of the Echo models below can control a wide variety smart home accessories using your voice or the Alexa App. Each has access to the thousands of third-party skills developers have made over the past couple of years as well as your Prime Music, Amazon Music Unlimited, or Spotify library. Most Echos have an audio out port to connect to external speakers, too. In the slides below, we're going to focus on what makes the best Echos sta...