Smart speakers: Is it Alexa, Google or Apple for you? Here's what you need to know to decide

You've thought long and hard about it, and you're finally ready to buy a smart speaker. They're all being heavily marketed for Black Friday sales, and you'd like to ask Siri, Alexa or the Google Assistant to play music, tell you the weather, turn off your TV or lights on command. But you're stuck: Which brand and model to buy? Amazon has five Echo speakers currently available, Google has six and Apple has two. Which one is right for you? And then there are the concerns about security and snooping.