How to choose the best smart speaker for you: shopper's guide

Amazon's Echo devices are powered by its Alexa artificial intelligence. LOS ANGELES -- Hey, Alexa, which of the seven Echo speakers should I buy, and what's the difference between them? And OK Google, the new Home Mini is so affordable at $29 for the holidays. How does it stack up to the entry level Echo, Amazon's Dot? If you're shopping for a smart speaker, here's how to decide which model and brand fits your needs and some advice on what to do once you own one.